@article{IVM_2001_3_a6,
     author = {L. A. Masal'tsev},
     title = {Surfaces with planar lines of curvature in {Lobachevskii} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--46},
     publisher = {mathdoc},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2001_3_a6/}
}