TY - JOUR AU - N. M. Maskin TI - An indicator quadratic form and the stability of solutions of a system of differential equations JO - Differencialʹnye uravneniâ PY - 1992 SP - 395 EP - 398 VL - 28 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1992_28_3_a3/ LA - ru ID - DE_1992_28_3_a3 ER -