@article{MMO_1977_34_a5,
     author = {G. K. Genov},
     title = {Associative functorial operations on the class of groups},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {195--212},
     publisher = {mathdoc},
     volume = {34},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1977_34_a5/}
}