TY - JOUR AU - M. F. Gorodnii AU - A. V. Chaikovskii TI - A~generalization of the concept of sectorial operator JO - Sbornik. Mathematics PY - 2006 SP - 977 EP - 995 VL - 197 IS - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_2006_197_7_a1/ LA - en ID - SM_2006_197_7_a1 ER -