TY - JOUR AU - B. L. Shekhter TI - A boundary value problem of periodic type for a second-order nonlinear ordinary differential equation JO - Differencialʹnye uravneniâ PY - 1986 SP - 1551 EP - 1556 VL - 22 IS - 9 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1986_22_9_a9/ LA - ru ID - DE_1986_22_9_a9 ER -