@article{GDZPPN002204444,
title = {Asymptotics of the number of zeros and of the eigenvalues of general weighted Sturm-Liouville problems.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {374},
year = {1987},
pages = {380-393},
zbl = {0599.34026},
url = {http://dml.mathdoc.fr/item/GDZPPN002204444}
}
Atkinson, F.V.; Mingarelli, A.B. Asymptotics of the number of zeros and of the eigenvalues of general weighted Sturm-Liouville problems.. Journal für die reine und angewandte Mathematik, Tome 374 (1987) pp. 380-393. http://gdmltest.u-ga.fr/item/GDZPPN002204444/