Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1960_3_a18, author = {P. N. Knyazev}, title = {A~completely continuous perturbation of the {Hill} equation on the half-line}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {163--167}, publisher = {mathdoc}, number = {3}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1960_3_a18/} }
P. N. Knyazev. A~completely continuous perturbation of the Hill equation on the half-line. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1960), pp. 163-167. http://geodesic.mathdoc.fr/item/IVM_1960_3_a18/