TY - JOUR AU - Yu. G. Borisovich AU - V. F. Subbotin TI - The displacement operator on the trajectories of equations of evolution, and periodic solutions JO - Doklady Akademii Nauk PY - 1967 SP - 9 EP - 12 VL - 175 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1967_175_1_a0/ LA - ru ID - DAN_1967_175_1_a0 ER -