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@article{MM_1995_7_5_a31, author = {V. S. Mokeichev}, title = {Existence of non-zero periodic solution of differential equations}, journal = {Matemati\v{c}eskoe modelirovanie}, pages = {58}, publisher = {mathdoc}, volume = {7}, number = {5}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MM_1995_7_5_a31/} }
V. S. Mokeichev. Existence of non-zero periodic solution of differential equations. Matematičeskoe modelirovanie, Tome 7 (1995) no. 5. http://geodesic.mathdoc.fr/item/MM_1995_7_5_a31/