Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1975_223_1_a17, author = {L. P. Grishchuk and M. V. Sazhin}, title = {Petrov classification of standing and traveling gravitational waves}, journal = {Doklady Akademii Nauk}, pages = {72--75}, publisher = {mathdoc}, volume = {223}, number = {1}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_223_1_a17/} }
L. P. Grishchuk; M. V. Sazhin. Petrov classification of standing and traveling gravitational waves. Doklady Akademii Nauk, Tome 223 (1975) no. 1, pp. 72-75. http://geodesic.mathdoc.fr/item/DAN_1975_223_1_a17/