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@article{MV_1968_20_1_a8, author = {D. D. Bajnov}, title = {Ob usrednenij v nekotoryh sistemah obyknovennyh differencial'nyh uravnenij}, journal = {Matemati\v{c}ki vesnik}, pages = {53 }, publisher = {mathdoc}, volume = {20}, number = {1}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/MV_1968_20_1_a8/} }
D. D. Bajnov. Ob usrednenij v nekotoryh sistemah obyknovennyh differencial'nyh uravnenij. Matematički vesnik, Tome 20 (1968) no. 1, p. 53 . http://geodesic.mathdoc.fr/item/MV_1968_20_1_a8/