Methane saturation of coal strata as methane-coal solid solution

V. I. Vernadskii, History of Terrestrial Minerals of Earth's Crust [in Russian], Vol. 1, No. 1, Nauka, Leningrad (1925). D. S. Korzhinskii, “Filtrating effect in solutions and its significance in geology”, Izv. Akad. Nauk SSSR, Ser. Geol., No. 2 (1947). B. P. Bering, A. L. Maiers, and V. V. Serpinskii, “Problems of inertness of adsorbents”, Dokl. Akad. Nauk SSSR, Fiz.-Khim.,193, No. 1 (1970). I. L. Ettinger and N. V. Shul'man, Distribution of Methane in Pores of Coal [in Russian], Nauka, Moscow (1975).