@article{IVM_1961_2_a12,
     author = {A. Z. Petrov},
     title = {On a geodesic representation of {Einstein} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {130--136},
     year = {1961},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1961_2_a12/}
}