@article{1183426040, author = {Hille, Einar}, title = {Convex distribution of the zeros of Sturm-Liouville functions}, journal = {Bull. Amer. Math. Soc.}, volume = {28}, number = {9}, year = {1922}, pages = { 261-265}, language = {en}, url = {http://dml.mathdoc.fr/item/1183426040} }
Hille, Einar. Convex distribution of the zeros of Sturm-Liouville functions. Bull. Amer. Math. Soc., Tome 28 (1922) no. 9, pp. 261-265. http://gdmltest.u-ga.fr/item/1183426040/