Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1966_168_1_a3, author = {A. G. Kostyuchenko}, title = {Distribution of eigenvalues of singular differential operators}, journal = {Doklady Akademii Nauk}, pages = {21--24}, publisher = {mathdoc}, volume = {168}, number = {1}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_1_a3/} }
A. G. Kostyuchenko. Distribution of eigenvalues of singular differential operators. Doklady Akademii Nauk, Tome 168 (1966) no. 1, pp. 21-24. http://geodesic.mathdoc.fr/item/DAN_1966_168_1_a3/