@article{KUTGS_1989_19_a3,
     author = {J. R. Arteaga Bejarano},
     title = {Classification of second-order surfaces in a three-dimensional {Lobachevskii} space according to {Norden's} method},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {29--40},
     year = {1989},
     volume = {19},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1989_19_a3/}
}