%0 Journal Article %A N. S. Bojinov %T Sufficient conditions for the basis property, convergence and summability of the root expansion of a nonlocal Sturm--Liouville problem %J Doklady Akademii Nauk %D 1991 %P 1042-1047 %V 319 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1991_319_5_a2/ %G ru %F DAN_1991_319_5_a2