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Expansion and contraction of coal at various metamorphism under influence of $CH_{4}$ and mixture $CH_{4}$ and $CO_{2}$ sorption/desorption process / G. CEGLARSKA-STEFAŃSKA, K. ZARĘBSKA, S. HOŁDA // W: Theoretical and experimental studies of interfacial phenomena and their technological applications : V Ukrainian–Polish symposium ; 4–9 September, 2000 : collection of abstracts / Chemical Division of National Academy of Sciences of Ukraine [etc.]. — Odessa : SCSEIO, 2000. — S. 25–26