Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1970_4_a13, author = {L. D. \`Eskin}, title = {The semibounded solutions of the equation $y''-sp(x)y=0$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {112--119}, publisher = {mathdoc}, number = {4}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1970_4_a13/} }
L. D. Èskin. The semibounded solutions of the equation $y''-sp(x)y=0$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1970), pp. 112-119. http://geodesic.mathdoc.fr/item/IVM_1970_4_a13/