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2. Zhemchuzhnikov, Yu.A., and Ginzburg, A.S., Osnovy petrologii uglei (Principles of Coal Petrology), Moscow: Izd. AN SSSR, 1960.
3. Ammosov, I.I., Eremin, I.V., Babinskova, N.I., et al., Petrograficheskie osobennosti i svoistva uglei (Petrographic Features and Properties of Coal), Moscow: Izd. AN SSSR, 1963.
4. Stach, E., Mackowsky, M.-T., Teichmuller, M., et al., Stach’s Textbook of Coal Petrology, Berlin: Gebruder Borntraeger, 1982, 3rd ed.
5. Maiskaya, S.M. and Drozdova, T.V., Geokhhimiya organicheskogo veshchestva (Geochemistry of Organic Matter), Moscow: Nauka, 1964.