TY - JOUR AU - S. G. Krein AU - V. B. Osipov TI - Ljapunov functions and Cauchy problems for certain systems of partial differential equations JO - Differencialʹnye uravneniâ PY - 1970 SP - 2053 EP - 2061 VL - 6 IS - 11 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1970_6_11_a13/ LA - ru ID - DE_1970_6_11_a13 ER -