Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1981_17_9_a10, author = {V. P. Pisarenok}, title = {Singularities of a system of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1630--1634}, publisher = {mathdoc}, volume = {17}, number = {9}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1981_17_9_a10/} }
V. P. Pisarenok. Singularities of a system of differential equations. Differencialʹnye uravneniâ, Tome 17 (1981) no. 9, pp. 1630-1634. http://geodesic.mathdoc.fr/item/DE_1981_17_9_a10/