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@article{IVM_1969_3_a13, author = {O. V. Shimel'fenig}, title = {Certain conditions for the extension of generalized heaps}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {104--106}, publisher = {mathdoc}, number = {3}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1969_3_a13/} }
O. V. Shimel'fenig. Certain conditions for the extension of generalized heaps. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1969), pp. 104-106. http://geodesic.mathdoc.fr/item/IVM_1969_3_a13/