Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1991_50_6_a4, author = {V. A. Borovikov}, title = {Sturm--Liouville problem with irregular asymptotics of eigenvalues}, journal = {Matemati\v{c}eskie zametki}, pages = {43--51}, publisher = {mathdoc}, volume = {50}, number = {6}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_6_a4/} }
V. A. Borovikov. Sturm--Liouville problem with irregular asymptotics of eigenvalues. Matematičeskie zametki, Tome 50 (1991) no. 6, pp. 43-51. http://geodesic.mathdoc.fr/item/MZM_1991_50_6_a4/