TY - JOUR AU - S. V. Zhestkov AU - P. P. Zabreiko TI - On the Fixed Point Principle for Matrix Partial Differential Systems of Fedorov--Riccati Type JO - Differencialʹnye uravneniâ PY - 2004 SP - 840 EP - 843 VL - 40 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_2004_40_6_a13/ LA - ru ID - DE_2004_40_6_a13 ER -