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3. V. I. Kasatochkin and N. K. Larina, Structure and Properties of Coals [in Russian], Nedra, Moscow (1975).
4. I. L. Éttinger and N. B. Shul'man, Methane Distribution in Pores in Coal [in Russian], Nedra, Moscow (1975).
5. F. D. Pooley, ?The use of the electron microscope as a tool in mining research,? Min. Eng.,127, No. 90, 321?333 (1968).