Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1991_27_8_a19, author = {T. I. Ananich}, title = {Nonlinear periodic systems with a linear {Poincar\'e} mapping}, journal = {Differencialʹnye uravneni\^a}, pages = {1443--1444}, publisher = {mathdoc}, volume = {27}, number = {8}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_8_a19/} }
T. I. Ananich. Nonlinear periodic systems with a linear Poincar\'e mapping. Differencialʹnye uravneniâ, Tome 27 (1991) no. 8, pp. 1443-1444. http://geodesic.mathdoc.fr/item/DE_1991_27_8_a19/