Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1981_256_4_a18, author = {A. M. Zamorzaev and A. F. Palistrant}, title = {Geometric classification of the $P$-symmetries}, journal = {Doklady Akademii Nauk}, pages = {856--859}, publisher = {mathdoc}, volume = {256}, number = {4}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_256_4_a18/} }
A. M. Zamorzaev; A. F. Palistrant. Geometric classification of the $P$-symmetries. Doklady Akademii Nauk, Tome 256 (1981) no. 4, pp. 856-859. http://geodesic.mathdoc.fr/item/DAN_1981_256_4_a18/