%0 Journal Article %A O. A. Plaksina %T Asymptotic formulas for the spectrum of certain Sturm--Liouville boundary value problems %J Differencialʹnye uravneniâ %D 1983 %P 2009-2011 %V 19 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_11_a30/ %G ru %F DE_1983_19_11_a30