@article{DAN_1973_209_4_a18,
     author = {A. L. Zel'manov},
     title = {Kinemetric invariants and their relation to chronometric invariants in {Einstein{\textquoteright}s} gravitation theory},
     journal = {Doklady Akademii Nauk},
     pages = {822--825},
     publisher = {mathdoc},
     volume = {209},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_4_a18/}
}