TY - JOUR AU - B. S. Kalitin TI - Stability of Closed Invariant Sets of Semidynamical Systems. The Method of Sign Definite Lyapunov Functions JO - Differencialʹnye uravneniâ PY - 2002 SP - 1565 EP - 1566 VL - 38 IS - 11 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2002_38_11_a15/ LA - ru ID - DE_2002_38_11_a15 ER -