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@article{IVM_1959_3_a16, author = {\"U. G. Lumiste}, title = {On three-dimensional surfaces with three orthogonal families of asymptotics}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {173--185}, publisher = {mathdoc}, number = {3}, year = {1959}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1959_3_a16/} }
Ü. G. Lumiste. On three-dimensional surfaces with three orthogonal families of asymptotics. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1959), pp. 173-185. http://geodesic.mathdoc.fr/item/IVM_1959_3_a16/