@article{RM_1984_39_4_a15,
     author = {V. V. Pelipenko and D. D. Sokolov},
     title = {Extrinsic complete surfaces of~constant negative curvature {in~pseudo-Euclidean} space $E_{2,1}^3$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {135--136},
     publisher = {mathdoc},
     volume = {39},
     number = {4},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1984_39_4_a15/}
}