1. 3Shilov, V. M., and Lizko, N.N. The microecology ofthe intestine underextreme conditions. In: Chernigovskiy, V.N., Ed. Sanitary-Hygienic andPhysiologicalAspects ofManned Spacecraft.Problems inSpace Biology. Volume 42. Moscow, Nauka,1980, pp.140-170(inRussian).