%0 Journal Article %A A. S. Makin %T On Riesz means of biorthogonal expansions in root functions of nonselfadjoint extensions of the Schr\"odinger operator %J Doklady Akademii Nauk %D 1992 %P 472-475 %V 322 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1992_322_3_a7/ %G ru %F DAN_1992_322_3_a7