%0 Journal Article %A A. V. Savin %T An identity for squares of eigenfunctions of an infinite-zone Sturm--Liouville operator %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1984 %P 83-85 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1984_6_a21/ %G ru %F VMUMM_1984_6_a21