Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1983_34_4_a5, author = {R. S. Ismagilov}, title = {Continuous spectrum of second-order ordinary differential operators}, journal = {Matemati\v{c}eskie zametki}, pages = {535--547}, publisher = {mathdoc}, volume = {34}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a5/} }
R. S. Ismagilov. Continuous spectrum of second-order ordinary differential operators. Matematičeskie zametki, Tome 34 (1983) no. 4, pp. 535-547. http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a5/