Претрага
1076 items
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Development of Integrated Fuzzy Model for Mine Management Optimization
Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić (2023)Technoeconomic, environmental and safety criteria generally affect the management of metallic and non-metallic mining operations. The first basic question that needs to be addressed when planning ore mining is which methods are adequate and what is the optimal mining technology? Due to the complex geologic framework of ore deposits, geological exploration has rendered synonymous the inherent uncertainties, vagueness, and inaccuracies. As a result, subjective evaluation by engineers and expert experience have become increasingly important. Given that the natural language ...Miodrag Čelebić, Sanja Bajić, Dragoljub Bajić, Dejan Stevanović, Duško Torbica, Vladimir Malbašić. "Development of Integrated Fuzzy Model for Mine Management Optimization" in Comptes rendus de l’Académie Bulgare des Sciences, Bulgarian Academy of Sciences (2023). https://doi.org/10.7546/CRABS.2023.09.12
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Applying the Fuzzy Inference Model in Maintenance Centered to Safety: Case Study – Bucket Wheel Excavator
Predrag Jovančić, Miloš Tanasijević, Vladimir Milisavljević, Aleksandar Cvjetić, Dejan Ivezić, Uglješa Bugarić (2020)Predrag Jovančić, Miloš Tanasijević, Vladimir Milisavljević, Aleksandar Cvjetić, Dejan Ivezić, Uglješa Bugarić. "Applying the Fuzzy Inference Model in Maintenance Centered to Safety: Case Study – Bucket Wheel Excavator" in Applications and Challenges of Maintenance and Safety Engineering in Industry 4.0 , Pennsylvania : IGI Global (2020). https://doi.org/10.4018/978-1-7998-3904-0
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Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation
Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović. "Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation" in Thermal Science, National Library of Serbia (2023). https://doi.org/10.2298/TSCI220813168I
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Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event
Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco. "Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event" in Historical Biology (2023). https://doi.org/10.1080/08912963.2023.2190757
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Keyword Extraction from Parallel Abstracts of Scientific Publications
... sequences which denote the sequence of morpho- logical suffixes of its words [27,29]. Wikipedia is one of the most commonly used semantic sources: using n-grams that appear in Wikipedia article titles as candidates for keywords [22], utilizing Wikipedia as a thesaurus for candidate selection from documents’ ...
... Innovation and Entrepreneurship: Connecting the Knowledge Dots, Bari, Italy, pp. 1764–1777 (2015) 16. Stanković, R., Krstev, C., Vitas, D., Vulović, N., Kitanović, O.: Keyword-based search on bilingual digital libraries. In: Calì, A., Gorgan, D., Ugarte, M. (eds.) KEYSTONE 2016. LNCS, vol. 10151, pp ...Slobodan Beliga, Olivera Kitanović, Ranka Stanković, Sanda Martinčić-Ipšić . "Keyword Extraction from Parallel Abstracts of Scientific Publications" in Sematic Keyword-Based Search on Structured Data Sources - Third International KEYSTONE Conference, IKC 2017 Gdańsk, Poland, September 11–12, 2017 Revised Selected Papers and COST Action IC1302 Reports, Springer (2017)
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A bilingual digital library for academic and entrepreneurial knowledge management
A generic knowledge management process of organization, storage and retrieval of knowledge can suitably be fitted in a digital library. In the digital and knowledge age digital libraries can be used in knowledge management to handle intellectual assets and support knowledge creation. A multilingual digital library either stores content in more than one language or provides multilingual query access to monolingual content. In Serbia 18 of 308 scientific journals regularly published are bi-lingual, with papers simultaneously being in English ...... Improve the Performance of Web Search Engines, in Proceedings of the 6th International Conference on Language Resources and Evaluation, LREC 2008, N. Calzolari et al., Marrakech, Morocco. Lesk, M. (2005) Understanding digital libraries. Elsevier, San Francisco. Linzalone, R. (2008), “Leveraging ...
... E-journals, in Proceedings of the 8th International Conference on Language Resources and Evaluation, LREC 2012, May 2012, Istanbul, Turkey, eds. N. Calzolari et al., European Language Resources Association Istanbul, Turkey, 2012, pp. 16 ...Ranka Stanković, Cvetana Krstev, Biljana Lazić, Dalibor Vorkapić. "A bilingual digital library for academic and entrepreneurial knowledge management" in Proceeding of 10th International Forum on Knowledge Asset Dynamics — IFKAD 2015: Culture, Innovation and Entrepreneurship: connecting the knowledge dots, Bari, Italy, 10-12 June 2015, Bari : IFKAD (2015)
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Properties of fly ash and slag from the power plants
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method... in Serbia. It is located about 60km SSW of Belgrade, and covers an area of almost 600km2, extending in an E-W direction for up to 55km, and in the N-S direction up to 15km. This basin is divided into several fields („A”, „B”, „C”, „D”, „E”, „F”, „G”, „Veliki Crljeni”, „Šopić-Lazarevac”, „Tam- nava ...
... l studies.– Journal of the Serbian Chemical Society, 77/8, 1109–1127. Figure 6. Histogram of �y ash and slag results (StDev – Standard Deviation; N – number of samples). G eo lo g ia C ro a ti ca Geologia Croatica 69/3324 THOMAS, M. (2007): Optimizing the Use of Fly Ash in Concrete, Portland ...Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić. "Properties of fly ash and slag from the power plants" in Geologia Croatica, Zagreb : Croatian Geological Survey (2016). https://doi.org/10.4154/gc.2016.26
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Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names
In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...... P R F1 S T U D E N T S PERS_1 0.804 0.827 0.815 0.857 0.847 0.852 0.729 0.887 0.800 PERS_3 0.815 0.807 0.811 0.837 0.827 0.832 0.748 0.873 0.806 PERS_4 0.727 0.703 0.715 0.842 0.840 0.841 0.675 0.815 0.738 PERS_9 0.812 0.760 0.785 0.807 0.797 0.802 0.744 0.818 0.779 D A N A S PERS_1 0.819 0.870 ...Branislava Šandrih, Cvetana Krstev, Ranka Stanković. "Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names" in Proceedings - Natural Language Processing in a Deep Learning World, Incoma Ltd., Shoumen, Bulgaria (2019). https://doi.org/10.26615/978-954-452-056-4_122
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Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)
Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD... Swiss J. Geosci. 2008, 101, 139–183. [CrossRef] 16. ŠosterA.;Zavašnik, J.; O'Sullivan, P.; Herlec, U.; Potočnik Krajnc, B.; Palinkaš, L.; Zupančič, N.; Dolenec, M. Geochemistry of Bashibos-Bajrambos Metasedimentary Unit, Serbo-Macedonian Massif, North Macedonia: Implications for Age, Provenance and ...
... XRPD Dataset of Arsenopyrite from Šumadija-l(opaonik Ore District. Mendeley online data repository. Mendeley Data 2023. [CrossRef] 19. Morimoto, N.; Clark, L.A. Arsenopyrite Crystal-Chemical Relations. Am. Mineral. 1961, 46, 1448—1469. 20. Watanabe, M.; Williams, D.B. The Quantitative Analysis ...Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik. "Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)" in Crystals, MDPI AG (2023). https://doi.org/10.3390/cryst13020278
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Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)
Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu. "Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)" in Carbonates and Evaporites, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s13146-020-00550-3
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Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria
The choice of adequate mining machines is one of the most complex problems in the underground exploitation of mineral raw materials. The weight of such a decision is reflected in the high prices of these machines and the occurrence of even greater costs during their use if their choice was wrongly conceived. There are numerous examples from practice in which such decisions were made solely on the basis of comparing the prices of machines, without considering any of the ...utovarno-transportna mehanizacija, izbor, TOPSIS, entropija, standardna devijacija, težina kriterijumaVladimir Krivošić, Luka Crnogorac, Rade Tokalić. "Underground loading-haulage equipment selection with application of topsis method with different weighting methods of criteria" in Underground mining engineering, University of Belgrade - Faculty of Mining and Geology (2024)
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Povezivanje i detaljno snimanje donjeg potkopa rudnika ,,Crveni Breg“ na Avali
Jovan Obradović (2024)Cilj ovog Završnog rada na temu „Povezivanje i detaljno snimanje donjeg potkopa rudnika ,,Crveni Breg“ na Avali” jeste dobijanje koordinata tačaka jamskog poligonskog vlaka, kao i prikaz samog rudnika na osnovu detaljnog snimanja jame, kao poprečnih profila podzemne rudničke prostorije. U datom radu biće predstavljene metode koje su primenjene prilikom snimanja, kao i rezultati samih merenja i sva potrebna računanja da bi se došlo do potrebnih koordinata.Merenja za završni rad obavljena su tokom terenske nastave održane u junu 2024. godine ...... tabeli 2-4, orijentacione vrednosti koje važe samo do granice 0,8 M, gde je M imenilac iz razmere plana (R =1:M). U jednačini za dozvoljeno odstupanje n je broj veznih i prelomnih uglova u vlaku. 21 U slepim poligonskim vlakovima, dozvoljeno odstupanje se računa iz dva nezavisna merenja. Zapaža ...
... standardnih odstupanja za sve stranice opažanih horizontalnih pravaca računanjem iz neslaganja girusa po jednačini: ž|ae'} -} [Aa} _ | UKAr= i i (n-))(r-1) gde su: AG - odstupanja opažanih horizontalnih pravaca od sračunatih sredina; h - broj merenih girusa; F - broj opažanih horizontalnih ...
... P2 51.973 51.928 51.951 0.045| 0.002025 P2 P3 23.107 23.077 23.092 0.030| 0.000900 P3 P4 15.486| _15.486 15.486| 0.000| 0.000000| žAA 0.003025 n 4 od 0.019445|[mj 5.5 Merenje visinskih razlika Visinske razlike su merene metodom geometrijskog nivelmana, metodom nivelanja iz sredine „nap ...Jovan Obradović. Povezivanje i detaljno snimanje donjeg potkopa rudnika ,,Crveni Breg“ na Avali, 2024
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Hidrodinamička analiza procesa starenja bunara sa horzontalnim drenovima na beogradskom izvorištu podzemnih voda
Đorđije M. Božović (2023)Predmet istraživanja doktorske disertacije su bunari sa horizontalnim drenovima beogradskog izvorišta podzemnih voda, drugog najvećeg izvorišta ovog tipa na svetu, čiji je režim rada opterećen procesima intenzivnog starenja prisutnog od samog početka formiranja izvorišta, početkom 1950‒ih godina. Istraživanja sprovedena u okviru izrade disertacije su imala za cilj definisanje nove metodologije izučavanja procesa mehaničkog i biohemijskog kolmiranja drenova izradom detaljnih 3D numeričkih hidrodinamičkih modela, upotrebom postojećih, dostupnih i široko rasprostranjenih računarskih programa. Istraživanja su realizovana simulacijom ostvarenog režima podzemnih voda ...modeliranje podzemnih voda, hidrauličke karakteristike drenova, koeficijent propusnosti drenova, prifilterska zona drena, hidraulički otpori na drenovima, kolmiranje drenova, ulazne brzine podzemnih voda, MODFLOW, CLN Package... 109 Kresic, N., Mikszewski, A., 2012. Hydrogeological conceptual site models. Data analysis and visualization. CRC Press. DOI: 10.1007/s12665-014-3268-8 110 Kresic, N., 2009. Groundwater resources: sustainability, management, and restoration, 1st Edition. The McGraw-Hill. 111 Kresic, N., Panday, ...
... River near Belgrade. Geološki anali Balkanskoga poluostrva, 79 (1), 21–30. DOI: 10.2298/GABP1879021K 106 Kojic, M., Filipovic, N., Slavkovic, R., Zivkovic, M., Grujovic, N., 1998. PAK–P Finite element program for modeling of undergroundwater flow and seepage. Faculty of Mech. Eng. Univ. of Kragujevac ...
... disertacija 123 Mansuy, N., 1998. Water well rehabilitation. A practical guide to understanding well problems and solutions. Layne GeoSciences, Inc., Lewis Publishers. DOI: 10.1201/9780203734063 124 Marović, M., Djoković, I., Pešić, L., Radovanović, S., Toljić, M., Gerzina, N., 2002. Neotectonics ...Đorđije M. Božović. Hidrodinamička analiza procesa starenja bunara sa horzontalnim drenovima na beogradskom izvorištu podzemnih voda, Beograd : [Đ. Božović], 2023
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Tеслапедиа као централна база библиографских података о Николи Тесли
Циљ овог рада је да прикаже идеју и процес израде најкомплетније електронске библиографске базе о Николи Тесли, симболично назване Теслапедиа. Oвaквa бaзa би укључивaлa Teслину библиoгрaфиjу, кao и библиoгрaфиjу других o њeму. Сaм кoнцeпт рaзвoja Teслaпeдиe je видљив крoз двe глaвнe идeje. Првa идeja je зaснoвaнa нa пoстaвљaњу свих пoстojeћих библиoгрaфских јединица кoje Mузej пoсeдуje нa oдрeђeну вeб-лoкaциjу a другa, пoдjeднaкo вaжнa, oглeдa сe у мoгућнoстимa дaљeг рaзвoja и нaдгрaдњe сaмe структурe базе придруживaњeм нoвих библиoгрaфских пoдaтaкa. Oвa бaзa ...... s. - The Repository is available at: www.dr.rgf.bg.ac.rs 70 Читалиште 23 (новембар 2013) МРЕЖА УДК 004.6:012 Tesla N. 069.02:621.31(497.11 Beograd) 069.02:929 Tesla N. Стручни рад Увод Раз вој ин фор ма ци о ног дру штва мо же мо пра- ти ти још од дав не 1800. го ди не. На кон на стан ка ...Ивана Ћирић, Сузана Топаловић, Биљана Лазић. "Tеслапедиа као централна база библиографских података о Николи Тесли" in Читалиште (2013)
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Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer
Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)... Hungarian-serbian nqu6r, lul 160000 140000 120000 100000 z* x -7^*, \-,/. Muoooo $) *0000 40000 200uu 20000 660000 480000- EOY *roPooo .l $n) 640000 I czoooo r000 0 *1000 *2000 r c -3000 o 9 -+ooo !) E -5000 -6000 -7000 -8000 *"l,o,Tio 75oooo Figure 4.9.2 Three-dimensional model ...Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić. "Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer" in Transboundary Water Resources Management - A Multidisciplinary Approach, Weinheim, Germany : Wiley-VCH (2011): 143-149
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Дигиталне библиотеке у рударству и геологији са посебним освртом на представљање сиве литературе
Имајући у виду потребу за проналажењем информација похрањених у различитим облицима документације која се генерише у областима рударства и геологије на Рударско-геолошком факултету Универзитета у Београду, отпочет је процес развоја дигиталне библиотеке ROmeka@RGF, на платформи за приказивање дигиталних колекција - Омека. Значајан део документације представља такозвана сива литература која је претежно заступљена у виду вишетомне документацијe. Први савладани изазов представљало је повезивање различитих вишетомних делова пројектних извештаја у једну целину која би била лако доступна и претражива.... Term Extraction and Lemmatization”. 10th International Conference on Language Resources and Evaluation, LREC 2016, Portorož, Slovenia. Calzolari, N., et al. (ur.). Paris :The European Language Resources Association (ELRA), 2016. 507-514. 158 BIBLIOINFO Томашевић, Александра, Биљана Лазић, Далибор ...Биљана Лазић, Александра Томашевић, Михаило Шкорић. "Дигиталне библиотеке у рударству и геологији са посебним освртом на представљање сиве литературе" in Научна конференција Библиоинфо — 55 година од покретања наставе библиотекарства на високошколском нивоу, Београд 18. мај 2017., Филолошки факултет Универзитета у Београду (2019). https://doi.org/10.18485/biblioinfo.2017.ch13
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Оцена перспективности изворишта "Вић баре" за водоснабдевање Обреновца
... 3). 140 — 140 — — — 120 Regeneracija Regeneracija Regeneracija Regeneracija 120 Regeneracija Regeneracija Regeneracija 100 100 2 80 Zz 80 = MS__ = ~N ™m o 60 —— o 60 40 —S ——_] «0 J | 20 20 (0) oO 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 ...Бојан Хајдин, Душан Поломчић, Зоран Стевановић, Драгољуб Бајић, Катарина Хајдин. "Оцена перспективности изворишта "Вић баре" за водоснабдевање Обреновца" in XIV Српски симпозијум о хидрогеологији са међународним учешћем, Рударско-геолошки факултет, Београд (2012)
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Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik
Tunel „Debelo brdo“ nazvan je po najizraženijem relјefnom obliku na ovoj drugoj deonici autoputa E-80 Niš – Pločnik. Osnovnu geološku građu na lokaciji tunela čini Mio-Plioceni kompleks heterogenog litološkog sastava. Izgradnja tunela je predviđena delom u otvorenom iskopu dužine 240 m, a delom sa podzemnim iskopom dužine 190 m. U zoni tunela, padina je okarakterisana kao uslovno stabilna, pa bi neadekvatna zasecanja mogla da izazovu klizanja terena. Iz tih razloga, u okviru rada posebno su prikazani geotehnički uslovi izgradnje ...... ravnog stanja deformacija (2D), tako da se ali, uz p najbitniji faktor napona oko tunelskog iskopa (p0) i jednoaksijalne ( cm): 0 s cm 2p N Kada je faktor stabilnosti Ns faktor stabilnosti Ns > 1. - j. deo ste Da bi se stepen relaksacije koeficijentom cr, : gde je K = ...Dragoslav Rakić, Radojica Lapčević, Irena Basarić Ikodinović, Dragan Lukić. "Geotehnički uslovi izgradnje tunela „Debelo brdo“ na autoputu E-80 Niš - Pločnik" in Četvrti Srpski kongres o putevima, 2-3. jun 2022., Beograd : Srpsko društvo za puteve Via Vita (2022)
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The East Serbian Paleocene alkaline rocks revisited: Evidence of decoupling of Sr-Nd and Pb isotopes in anorogenic setting
Cvetković Vladica, Šarić Kristina, Hoeck Volker, Prelević Dejan, Neubauer Franz, von Quadt Albrecht (2012)Cvetković Vladica, Šarić Kristina, Hoeck Volker, Prelević Dejan, Neubauer Franz, von Quadt Albrecht. "The East Serbian Paleocene alkaline rocks revisited: Evidence of decoupling of Sr-Nd and Pb isotopes in anorogenic setting" in International Earth Science Colloquium on the Aegean Region, IESCA-2012, 1-5 October. Abstracts, Izmir:Dokuz Eylül Üniversitesi (2012): 74-74
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Genesis and metallogenetic setting of the polymetallic barite-sulphide deposit, Bobija, Western Serbia
Marcel Maurer, Dejan Prelević, Regina Mertz-Kraus, Aleksandar Pačevski, Bojan Kostić, Jovana Malbašić (2019)Trejs elementi u sfaleritu, izotopi sumpora, datiranje cirkonom, SEDEX, SHMS, dominantno klastični Pb-Zn, sulfidi, ležištaMarcel Maurer, Dejan Prelević, Regina Mertz-Kraus, Aleksandar Pačevski, Bojan Kostić, Jovana Malbašić. "Genesis and metallogenetic setting of the polymetallic barite-sulphide deposit, Bobija, Western Serbia" in International Journal of Earth Sciences, Springer Science and Business Media LLC (2019). https://doi.org/10.1007/s00531-019-01732-8