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@article{IVM_1980_5_a8, author = {I. V. Protasov}, title = {A theorem of {Mac} {Lane}}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {40--41}, publisher = {mathdoc}, number = {5}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1980_5_a8/} }
I. V. Protasov. A theorem of Mac Lane. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1980), pp. 40-41. http://geodesic.mathdoc.fr/item/IVM_1980_5_a8/