%0 Journal Article %A A. B. Budak %A V. N. Denisov %T Some properties of characteristic functions of the Sturm--Liouville operator with discontinuous coefficients %J Matematičeskie zametki %D 1987 %P 819-830 %V 42 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1987_42_6_a5/ %G ru %F MZM_1987_42_6_a5