@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/}
}