@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/}
}