Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1975_11_10_a24, author = {V. N. Laptinskii}, title = {Linear systems with periodic coefficients}, journal = {Differencialʹnye uravneni\^a}, pages = {1899--1901}, publisher = {mathdoc}, volume = {11}, number = {10}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_10_a24/} }
V. N. Laptinskii. Linear systems with periodic coefficients. Differencialʹnye uravneniâ, Tome 11 (1975) no. 10, pp. 1899-1901. http://geodesic.mathdoc.fr/item/DE_1975_11_10_a24/