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@article{IVM_1974_6_a5, author = {I. I. Mel'nik}, title = {$K$-operatives}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {47--55}, publisher = {mathdoc}, number = {6}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1974_6_a5/} }
I. I. Mel'nik. $K$-operatives. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1974), pp. 47-55. http://geodesic.mathdoc.fr/item/IVM_1974_6_a5/