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@article{IVM_1959_1_a9, author = {\"U. G. Lumiste}, title = {On $n$-dimensional surfaces with asymptotic fields of $p$-directions}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {105--113}, publisher = {mathdoc}, number = {1}, year = {1959}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1959_1_a9/} }
Ü. G. Lumiste. On $n$-dimensional surfaces with asymptotic fields of $p$-directions. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1959), pp. 105-113. http://geodesic.mathdoc.fr/item/IVM_1959_1_a9/