TY - JOUR AU - V. V. Mironenko TI - Time symmetry preserving perturbations of differential systems JO - Differencialʹnye uravneniâ PY - 2004 SP - 1325 EP - 1332 VL - 40 IS - 10 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2004_40_10_a4/ LA - ru ID - DE_2004_40_10_a4 ER -