Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1985_21_9_a29, author = {A. D. Myshkis}, title = {Theorems of {Sturm} type for linear systems of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1639--1641}, publisher = {mathdoc}, volume = {21}, number = {9}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_9_a29/} }
A. D. Myshkis. Theorems of Sturm type for linear systems of differential equations. Differencialʹnye uravneniâ, Tome 21 (1985) no. 9, pp. 1639-1641. http://geodesic.mathdoc.fr/item/DE_1985_21_9_a29/