%0 Journal Article %A B. M. Levitan %T Sturm-liouville operators on the whole line, with the same discrete spectrum %J Sbornik. Mathematics %D 1988 %P 77-106 %V 60 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1988_60_1_a5/ %G en %F SM_1988_60_1_a5