@article{MV_1970_22_1_a5,
     author = {D. D. Bainov},
     title = {Substantiation of the method of averaging for a two point boundary value problem for ordinary differential equations, unsolved with respect to the derivative},
     journal = {Matemati\v{c}ki vesnik},
     pages = {29 },
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/MV_1970_22_1_a5/}
}