Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1984_165_a15, author = {A. N. Tyurin}, title = {Local and global invariants of a~four-dimensional {pseudo-Riemannian} manifold}, journal = {Informatics and Automation}, pages = {205--219}, publisher = {mathdoc}, volume = {165}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1984_165_a15/} }
A. N. Tyurin. Local and global invariants of a~four-dimensional pseudo-Riemannian manifold. Informatics and Automation, Algebraic geometry and its applications, Tome 165 (1984), pp. 205-219. http://geodesic.mathdoc.fr/item/TRSPY_1984_165_a15/