%0 Journal Article %A Yu. V. Pokornyi %A M. B. Zvereva %A S. A. Shabrov %T Some questions of the qualitative theory of nonsmooth Sturm-Liouville problems %J Trudy Seminara im. I.G. Petrovskogo %D 2007 %P 255-274 %V 26 %N 26 %I mathdoc %U http://geodesic.mathdoc.fr/item/TSP_2007_26_26_a11/ %G ru %F TSP_2007_26_26_a11