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@article{DAN_1985_285_3_a11, author = {A. I. Tovbis}, title = {Systems of linear differential equations with a small parameter}, journal = {Doklady Akademii Nauk}, pages = {566--570}, publisher = {mathdoc}, volume = {285}, number = {3}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1985_285_3_a11/} }
A. I. Tovbis. Systems of linear differential equations with a small parameter. Doklady Akademii Nauk, Tome 285 (1985) no. 3, pp. 566-570. http://geodesic.mathdoc.fr/item/DAN_1985_285_3_a11/