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@article{MZM_1982_32_6_a5, author = {B. I. Selivanov}, title = {A combinatorial proof of the enumeration theorem for exponentiation of groups}, journal = {Matemati\v{c}eskie zametki}, pages = {809--816}, publisher = {mathdoc}, volume = {32}, number = {6}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1982_32_6_a5/} }
B. I. Selivanov. A combinatorial proof of the enumeration theorem for exponentiation of groups. Matematičeskie zametki, Tome 32 (1982) no. 6, pp. 809-816. http://geodesic.mathdoc.fr/item/MZM_1982_32_6_a5/