TY - JOUR AU - Kh. Abduvaitov TI - Some sufficient conditions for the existence of periodic and of bounded solutions of second-order nonlinear differential equations JO - Differencialʹnye uravneniâ PY - 1985 SP - 2027 EP - 2036 VL - 21 IS - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1985_21_12_a0/ LA - ru ID - DE_1985_21_12_a0 ER -