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@article{MAT_1962_6_5_a6, author = {Ph. Hartman}, title = {On boundary value problems for systems of ordinary, nonlinear, second order differential equations}, journal = {Matematika}, pages = {69--86}, publisher = {mathdoc}, volume = {6}, number = {5}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1962_6_5_a6/} }
Ph. Hartman. On boundary value problems for systems of ordinary, nonlinear, second order differential equations. Matematika, Tome 6 (1962) no. 5, pp. 69-86. http://geodesic.mathdoc.fr/item/MAT_1962_6_5_a6/