%0 Journal Article %A I. Jo %A N. Lažetić %T Derivatives of partial sums of spectral decompositions corresponding to nonnegative selfadjoint extensions of Sturm--Liouville operators %J Doklady Akademii Nauk %D 1979 %P 534-536 %V 246 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1979_246_3_a4/ %G ru %F DAN_1979_246_3_a4