%0 Journal Article %A Ü. G. Lumiste %T On three-dimensional surfaces with three orthogonal families of asymptotics %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1959 %P 173-185 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1959_3_a16/ %G ru %F IVM_1959_3_a16