%0 Journal Article %A M. F. Gorodnii %A A. V. Chaikovskii %T A~generalization of the concept of sectorial operator %J Sbornik. Mathematics %D 2006 %P 977-995 %V 197 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2006_197_7_a1/ %G en %F SM_2006_197_7_a1