@article{1077466123, author = {Weinberger, H. F.}, title = {An extension of the classical Sturm-Liouville theory}, journal = {Duke Math. J.}, volume = {22}, number = {1}, year = {1955}, pages = { 1-14}, language = {en}, url = {http://dml.mathdoc.fr/item/1077466123} }
Weinberger, H. F. An extension of the classical Sturm-Liouville theory. Duke Math. J., Tome 22 (1955) no. 1, pp. 1-14. http://gdmltest.u-ga.fr/item/1077466123/