%0 Journal Article %A V. S. Monakhov %T The product of two groups, one of which contains a~cyclic subgroup of index $\le2$ %J Matematičeskie zametki %D 1974 %P 285-295 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1974_16_2_a12/ %G ru %F MZM_1974_16_2_a12