Petrographic composition of lignite from the Lake Somerville Spillway (East-central Texas) / Sandra PAWELEC, Barbara BIELOWICZ // IOP Conference Series: Earth and Environmental Science ; ISSN 1755-1307. — 2017 vol. 95 art. no. 022028, s. 1–12. — Bibliogr. s. 11–12, Abstr.. — Publikacja dostępna online od: 2017-12-21. — WMESS 2017 : World Multidisciplinary Earth Sciences Symposium : 11–15 September 2017, Prague, Czech Republic. — tekst: https://goo.gl/Mzsc5K