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@article{DE_1987_23_2_a21, author = {I. V. Kamenev}, title = {On an asymptotic formula of {Hartman} in the theory of second-order linear equations}, journal = {Differencialʹnye uravneni\^a}, pages = {348--350}, publisher = {mathdoc}, volume = {23}, number = {2}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_2_a21/} }
I. V. Kamenev. On an asymptotic formula of Hartman in the theory of second-order linear equations. Differencialʹnye uravneniâ, Tome 23 (1987) no. 2, pp. 348-350. http://geodesic.mathdoc.fr/item/DE_1987_23_2_a21/