Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1993_328_5_a3, author = {L. V. Zilbergleit and V. V. Lychagin}, title = {Spencer cohomology of invariant systems of differential equations}, journal = {Doklady Akademii Nauk}, pages = {544--546}, publisher = {mathdoc}, volume = {328}, number = {5}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1993_328_5_a3/} }
L. V. Zilbergleit; V. V. Lychagin. Spencer cohomology of invariant systems of differential equations. Doklady Akademii Nauk, Tome 328 (1993) no. 5, pp. 544-546. http://geodesic.mathdoc.fr/item/DAN_1993_328_5_a3/