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3. P. A. Kozhevin, Microbial Populations in Nature (Mosk. Gos. Univ., Moscow, 1989) [in Russian].
4. S. I. Kuznetsov and G. A. Dubinina, Methods of Study of Aquatic Microorganisms) (Nauka, Moscow, 1989) [in Russian].
5. V. I. Romanenko and E. G. Dobrynin, “Determination of the Specific Weight of Dry Bacterial Cells,” Inform. Byul. Inst. Biol. Vnutr. Vod AN SSSR, No. 16, 6–8 (1972).