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@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/} }
V. S. Lenev. The projective differential geometry of two-dimensional nets.~I. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1974), pp. 53-59. http://geodesic.mathdoc.fr/item/IVM_1974_7_a6/