TY - JOUR AU - M. M. Khapaev TI - On the determination of averaged physical parameters in periodic JO - Doklady Akademii Nauk PY - 1990 SP - 857 EP - 859 VL - 315 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1990_315_4_a21/ LA - ru ID - DAN_1990_315_4_a21 ER -