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@article{IVM_1965_4_a16, author = {M. A. Spivak}, title = {Conditions for the resolvability of a relation into a direct sum}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {132--139}, publisher = {mathdoc}, number = {4}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1965_4_a16/} }
M. A. Spivak. Conditions for the resolvability of a relation into a direct sum. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1965), pp. 132-139. http://geodesic.mathdoc.fr/item/IVM_1965_4_a16/