Zdravkov Alexander,Bechtel Achim,Stojanovic Ksenija A,Gross Doris,Weitz Johannes,Kojic Ivan D,Sachsenhofer Reinhard F,Misch David,Zivotic Dragana R (2025) Petrological and organic geochemical insights into the peat-forming environmental settings during the deposition of the early Oligocene Pirin coal deposit, SW Bulgaria, INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 308, br. , str. - (Article) 

Zdravkov Alexander,Gross Doris,Zivotic Dragana R,Kojic Ivan D,Stojanovic Ksenija A,Bechtel Achim (2024) Preliminary petrographic assessment of the suitability of Bobov Dol coals, SW Bulgaria for fluidized-bed coal gasification, SPISANIE NA B LGARSKOTO GEOLOGICHESKO DRUZHESTOV-REVIEW OF THE BULGARIAN GEOLOGICAL SOCIETY, vol. 85, br. , str. 79-84 (Article) 

Kojic Ivan D,Novkovic Zeljana N,Stojanovic Ksenija A,Zivotic Dragana R,Bechtel Achim,Sachsenhofer Reinhard F (2024) Organic petrography and biomarker proxies of subbituminous coal from the Dubrava field (Aleksinac Basin, Serbia), SPISANIE NA BALGARSKOTO GEOLOGICHESKO DRUZHESTOV-REVIEW OF THE BULGARIAN GEOLOGICAL SOCIETY, vol. 85, br. , str. 53-65 (Article) 

Zdravkov Alexander,Gross Doris,Zivotic Dragana R,Kojic Ivan D,Stojanovic Ksenija A,Bechtel Achim (2024) Organic petrology as a tool for peat-forming environmental reconstructions: insights from Suhostrel and Bobov Dol coals, SW Bulgaria, SPISANIE NA B LGARSKOTO GEOLOGICHESKO DRUZHESTOV-REVIEW OF THE BULGARIAN GEOLOGICAL SOCIETY, vol. 85, br. , str. 41-46 (Article) 

Liu Bangjun,Bechtel Achim,Stojanovic Ksenija A,Hower James C,Zhao Cunliang,Guo Xu (2024) Organic petrography, biomarkers, and stable isotope ( δ<SUP>13</SUP>C,δD,δ<SUP>15</SUP>N,δ<SUP>18</SUP>O) compositions of liptinite-rich coals, INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 290, br. , str. - (Article) 

Zdravkov Alexander,Bechtel Achim,Gross Doris,Kojic Ivan D,Stojanovic Ksenija A,Zivotic Dragana R (2024) Paleovegetation and environment during deposition of the Late Oligocene sub-bituminous coal in the Bobov Dol Basin (SW Bulgaria) as deduced from petrographic and geochemical characteristics, INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 285, br. , str. - (Article) 

Andric-Tomasevic Nevena,Simic Vladimir M,Zivotic Dragana R,Nikolic Nenad T,Pavlovic Aleksandra,Kluge Tobias,Beranoaguirre Aratz,Smit Jeroen,Bechtel Achim (2024) Tectonically induced travertine deposition in the Middle Miocene Levač intramountain basin (Central Serbia), SEDIMENTOLOGY, vol. 71, br. 4, str. 1214-1244 (Article) 

Zdravkov Alexander,Gross Doris,Bechtel Achim,Stojanovic Ksenija A,Kojic Ivan D (2023) Depositional settings of the Eocene Suhostrel bituminous coal, SW Bulgaria, inferred from organic petrology and molecular proxies, INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 276, br. , str. - (Article) 

Kojic Ivan D,Bechtel Achim,Aleksic Nikoleta M,Zivotic Dragana R,Trifunovic Snezana S,Gajica Gordana D,Stojanovic Ksenija A (2021) Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal, POLYMERS, vol. 13, br. 5, str. - (Article) 

Nytoft Hans Peter,Kildahl-Andersen Geir,Lindstrom Sofie,Rise Frode,Bechtel Achim,Mitrovic Danica,Djokovic Natasa,Zivotic Dragana R,Stojanovic Ksenija A (2019) Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae, ORGANIC GEOCHEMISTRY, vol. 129, br. , str. 14-23 (Article) 

Kojic Ivan D,Bechtel Achim,Kittinger Friedrich,Stevanovic Nikola R,Obradovic Marko O,Stojanovic Ksenija A (2018) Study of pyrolysis of high density polyethylene in the open system and estimation of its capability for co-pyrolysis with lignite, JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, vol. 83, br. 7-8, str. 923-940 (Article) 

Djokovic Natasa,Mitrovic Danica,Zivotic Dragana R,Bechtel Achim,Sachsenhofer Reinhard F,Matic Vesna,Glamocanin Lidija,Stojanovic Ksenija A (2018) Petrographical and organic geochemical study of the lignite from the Smederevsko Pomoravlje field (Kostolac Basin, Serbia), INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 195, br. , str. 139-171 (Article) 

Djokovic Natasa,Mitrovic Danica,Zivotic Dragana R,Bechtel Achim,Sachsenhofer Reinhard F,Stojanovic Ksenija A (2018) Petrographic and biomarker analysis of xylite-rich coal from the Kolubara and Kostolac lignite basins (Pannonian Basin, Serbia), GEOLOGICA CARPATHICA, vol. 69, br. 1, str. 51-70 (Article) 

Bechtel Achim,Oberauer Klaus,Kostic Aleksandar,Gratzer Reinhard,Milisavljevic Vladimir,Aleksic Nikoleta M,Stojanovic Ksenija A,Gross Doris,Sachsenhofer Reinhard F (2018) Depositional environment and hydrocarbon source potential of the Lower Miocene oil shale deposit in the Aleksinac Basin (Serbia), ORGANIC GEOCHEMISTRY, vol. 115, br. , str. 93-112 (Article) 

Mitrovic Danica,Djokovic Natasa,Zivotic Dragana R,Bechtel Achim,Cvetkovic Olga G,Stojanovic Ksenija A (2017) Characterisation of lignite lithotypes from the "Kovin" deposit (Serbia) - Implications from petrographic, biomarker and isotopic analysis, JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, vol. 82, br. 6, str. 739-754 (Article) 

Mitrovic Danica,Djokovic Natasa,Zivotic Dragana R,Bechtel Achim,Sajnovic Aleksandra M,Stojanovic Ksenija A (2016) Petrographical and organic geochemical study of the Kovin lignite deposit, Serbia, INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 168, br. , str. 80-107 (Article) 

Rundic Ljupko M,Vasic Nebojsa D,Zivotic Dragana R,Bechtel Achim,Knezevic Slobodan,Cvetkov Vesna (2016) The Pliocene Paludina Lake of Pannonian Basin: New Evidence from Northern Serbia, ANNALES SOCIETATIS GEOLOGORUM POLONIAE, vol. 86, br. 2, str. 185-209 (Article) 

Zivotic Dragana R,Bechtel Achim,Sachsenhofer Reinhard F,Gratzer Rainhard,Radic Dejan B,Obradovic Marko O,Stojanovic Ksenija A (2014) Petrological and organic geochemical properties of lignite from the Kolubara and Kostolac basins, Serbia: Implication on Grindability Index, INTERNATIONAL JOURNAL OF COAL GEOLOGY, vol. 131, br. , str. 344-362 (Article)