Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1983_19_9_a7, author = {V. P. Skripnik}, title = {Degenerate systems and a degenerate parameter}, journal = {Differencialʹnye uravneni\^a}, pages = {1527--1534}, publisher = {mathdoc}, volume = {19}, number = {9}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1983_19_9_a7/} }
V. P. Skripnik. Degenerate systems and a degenerate parameter. Differencialʹnye uravneniâ, Tome 19 (1983) no. 9, pp. 1527-1534. http://geodesic.mathdoc.fr/item/DE_1983_19_9_a7/