@article{IVM_1974_7_a6,
     author = {V. S. Lenev},
     title = {The projective differential geometry of two-dimensional {nets.~I}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {53--59},
     publisher = {mathdoc},
     number = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_7_a6/}
}