TY - JOUR AU - D. D. Bainov TI - Substantiation of the method of averaging for a two point boundary value problem for ordinary differential equations, unsolved with respect to the derivative JO - Matematic̀Œki vesnik PY - 1970 SP - 29 VL - 22 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MV_1970_22_1_a5/ ID - MV_1970_22_1_a5 ER -