Some obligatory conditions and generalizations of the Fedorov theorem
We introduce a new type of conditions, S-obligatory conditions. We describe broad classes of groups with the Chernikov obligatory condition and some other conditions similar to the known Fedorov condition.
English version (Springer): Ukrainian Mathematical Journal 49 (1997), no. 4, pp 628-634.
Citation Example: Polovitskii Ya. D. Some obligatory conditions and generalizations of the Fedorov theorem // Ukr. Mat. Zh. - 1997. - 49, № 4. - pp. 566–572.