%0 Journal Article %A B. M. Levitan %T Properties of the Green's function for a Sturm--Liouville equation %J Sbornik. Mathematics %D 1968 %P 229-259 %V 5 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1968_5_2_a5/ %G en %F SM_1968_5_2_a5