@article{DAN_1958_121_1_a9,
     author = {G. F. Laptev},
     title = {Hypersurface in the space of projective connection},
     journal = {Doklady Akademii Nauk},
     pages = {41--44},
     publisher = {mathdoc},
     volume = {121},
     number = {1},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_1_a9/}
}