Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1979_15_8_a4, author = {N. I. Vulpe}, title = {Construction of a polynomial basis of comitants of a differential system}, journal = {Differencialʹnye uravneni\^a}, pages = {1399--1410}, publisher = {mathdoc}, volume = {15}, number = {8}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1979_15_8_a4/} }
N. I. Vulpe. Construction of a polynomial basis of comitants of a differential system. Differencialʹnye uravneniâ, Tome 15 (1979) no. 8, pp. 1399-1410. http://geodesic.mathdoc.fr/item/DE_1979_15_8_a4/