TY - JOUR AU - Yu. A. Ryabov TI - On a method of finding a bound for the region of existence of periodic and almost periodic solutions of quasilinear differential equations with a small parameter and a non-linear characteristic of non-linearity JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1963 SP - 101 EP - 107 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1963_2_a11/ LA - ru ID - IVM_1963_2_a11 ER -