TY - JOUR AU - M. A. Petrova AU - I. A. Shishmarev TI - Periodic solutions of partial differential equations with small parameters JO - Differencialʹnye uravneniâ PY - 1988 SP - 1276 EP - 1278 VL - 24 IS - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1988_24_7_a27/ LA - ru ID - DE_1988_24_7_a27 ER -