@article{RM_1978_33_4_a16,
     author = {D. D. Sokolov},
     title = {On~convex surfaces with~an~indefinite metric},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {265--266},
     publisher = {mathdoc},
     volume = {33},
     number = {4},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1978_33_4_a16/}
}