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@article{IVM_1988_12_a3, author = {M. V. Dragnev and V. V. Ryzhkov}, title = {Some classes of mappings of ~$P_3$ into ~$P_2$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {28--35}, publisher = {mathdoc}, number = {12}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1988_12_a3/} }
M. V. Dragnev; V. V. Ryzhkov. Some classes of mappings of ~$P_3$ into ~$P_2$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1988), pp. 28-35. http://geodesic.mathdoc.fr/item/IVM_1988_12_a3/