Factor analysis in determining the quality of coal / T. NIEDOBA, P. PIĘTA, A. SUROWIAK // W: MEC 2019 [Dokument elektroniczny] : conference of Mineral Engineering 2019 consisting of XXIV International Conference of Mineral Processing : LVI Symposium Physicochemical Problems of Mineral Processing : XV International Conference on Non-Ferrous Ore Processing (ICNOP) : Kocierz, September 16-19, 2019 : proceedings. — Wersja do Windows. — Dane tekstowe. — [Kocierz : s. n.], [2019]. — Dysk Flash. — S. 18. — Wymagania systemowe: Adobe Reader