Origin of hydrocarbon gases and carbon dioxide in Devonian-Carboniferous strata of the Upper Silesian and Lublin regions: isotopic, hydrous pyrolysis and geological approach / Maciej J. KOTARBA, Krzysztof JUREK, Tomasz ROMANOWSKI // W: ESIR 2019 : European Society for Isotope Research isotope workshop XV : Lublin, Poland, June 23–27, 2019 : book of abstracts / eds. Aleksander Anuar-Wójtowicz, Karolina Marciszuk. — Warsaw : Polish Geological Institute – National Research Institute, 2019. — ISBN: 978-83-66305-68-7. — S. 63–64. — Bibliogr. s. 64

Studies on nitrogen compounds, V and Ni concentrations and nitrogen isotopic composition of the crude oils of central and eastern parts of the Polish Outer Carpathians / Krzysztof JUREK, Tomasz ROMANOWSKI, Dariusz WIĘCŁAW // W: CAGG-AGH-2019 [Dokument elektroniczny] : “Challenges in Applied Geology and Geophysics: 100\textsuperscript{th} anniversary of applied geology at AGH University of Science and Technology” : international scientific conference : 10-13 September 2019, Kraków : book of abstracts / eds. Jadwiga Jarzyna, Paulina Krakowska-Madejska, Anna Sowiżdżał ; AGH. — Wersja do Windows. — Dane tekstowe. — Kraków : AGH University of Science and Technology, cop. 2019. — e-ISBN: 978-83-66364-18-9. — S. [1-2]. — Wymagania systemowe: Adobe Reader. — Tryb dostępu: http://www.cagg2019.agh.edu.pl/Book%20of%20Abstract%20pdf%20only/7%20Geochemistry/Jurek%20et%20al.pdf [2019-09-16]. — Bibliogr. s. [2]. — Toż. na dysku Flash. - S. 109-110. - Bibliogr. s. 110

The genesis of ozocerite in Carpathian region : biomarkers approach / Krzysztof JUREK, Adam Kowalski // W: 12\textsuperscript{th} GEOSYMPOSIUM of young researchers SILESIA 2019 : 2–4 September 2019, Tarnowskie Góry : book of abstracts / eds. Anna Abramowicz, Agnieszka Bracławska, Aleksander Brom, Dorota Fiedor, Marcelina Kondas, Kinga Ślósarczyk. — [Sosnowiec : Faculty of Earth Sciences. University of Silesia], [2019]. — ISBN: 978-83-955191-0-9. — S. 31. — Bibliogr. s. 31