@article{VMUMM_1984_6_a21,
     author = {A. V. Savin},
     title = {An identity for squares of eigenfunctions of an infinite-zone {Sturm{\textendash}Liouville} operator},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {83--85},
     year = {1984},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1984_6_a21/}
}