@article{KUTGS_1974_7_a8,
     author = {A. O. Korneeva},
     title = {Isotropic surfaces in {Lorentz} space},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {68--77},
     publisher = {mathdoc},
     volume = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1974_7_a8/}
}