@article{IVM_1960_1_a18,
     author = {A. Z. Petrov and V. R. Kaigorodov and V. N. Abdullin},
     title = {Klassifikation der {Gravitationsfelder} allgemeiner {Form} nach den {Bewegungsgruppen.~II,~III}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {175--187},
     publisher = {mathdoc},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1960_1_a18/}
}