Petrographic composition of lignite from the lake Somerville Spillway (East-Central Texas) / Sandra PAWELEC, Barbara BIELOWICZ // W: WMESS 2017 [Dokument elektroniczny] : World Multidisciplinary Earth Sciences Symposium : 11–15 September, 2017, Prague, Czech Republic : abstract collection book. — Wersja do Windows. — Dane tekstowe. — [Czech Republic : s. n.], [2017]. — 1 dysk optyczny. — S. [128]. — Wymagania systemowe: Adobe Reader

Petrographic composition of lignite from the Legnica deposit / Sandra PAWELEC, Marian WAGNER // W: 10\textsuperscript{th} Geosymposium of Young researchers Silesia 2017 : Zabrze, 21–23. 09. 2017 : abstract book / eds. Sylwia Skreczko [et al.]. — [Polska : s. n.], [2017]. — ISBN: 978-83-948694-0-3. — S. 32

Variability in the quality of the lignite from the Szczerców deposit in reference to the international classification / Sandra PAWELEC // W: 10\textsuperscript{th} Geosymposium of Young researchers Silesia 2017 : Zabrze, 21–23. 09. 2017 : abstract book / eds. Sylwia Skreczko [et al.]. — [Polska : s. n.], [2017]. — ISBN: 978-83-948694-0-3. — S. 31