@article{DAN_1971_197_4_a18,
     author = {A. V. Aminova},
     title = {On gravitational fields allowing groups of projective motions},
     journal = {Doklady Akademii Nauk},
     pages = {806--809},
     publisher = {mathdoc},
     volume = {197},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_197_4_a18/}
}