TY - JOUR AU - M. B. Sevryuk TI - Invariant tori of reversible systems in the presence of additional even coordinates JO - Doklady Akademii Nauk PY - 1992 SP - 421 EP - 424 VL - 326 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1992_326_3_a6/ LA - ru ID - DAN_1992_326_3_a6 ER -