Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1975_11_6_a18, author = {I. V. Kamenev}, title = {On {Hartman's} comparison theorem for second order linear equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1136--1137}, publisher = {mathdoc}, volume = {11}, number = {6}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_6_a18/} }
I. V. Kamenev. On Hartman's comparison theorem for second order linear equations. Differencialʹnye uravneniâ, Tome 11 (1975) no. 6, pp. 1136-1137. http://geodesic.mathdoc.fr/item/DE_1975_11_6_a18/