@article{DAN_1963_152_3_a17,
     author = {R. F. Bilyalov},
     title = {Conformal transformation groups in gravitational fields},
     journal = {Doklady Akademii Nauk},
     pages = {570--572},
     publisher = {mathdoc},
     volume = {152},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_3_a17/}
}