Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1983_19_9_a18, author = {M. Yu. Bogdanova and N. F. Naumovich}, title = {Differential equations with an area first integral}, journal = {Differencialʹnye uravneni\^a}, pages = {1613--1617}, publisher = {mathdoc}, volume = {19}, number = {9}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1983_19_9_a18/} }
M. Yu. Bogdanova; N. F. Naumovich. Differential equations with an area first integral. Differencialʹnye uravneniâ, Tome 19 (1983) no. 9, pp. 1613-1617. http://geodesic.mathdoc.fr/item/DE_1983_19_9_a18/