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@article{NUMA_1963__5_131571, author = {A. WEINSTEIN}, title = {On the {Sturm-Liouville} {Theory} and the {Eigenvalues} of {Intermediate} {Problems.}}, journal = {Numerische Mathematik}, pages = {238--245}, publisher = {mathdoc}, volume = {5}, year = {1963}, zbl = {0123.11501}, url = {http://geodesic.mathdoc.fr/item/NUMA_1963__5_131571/} }
A. WEINSTEIN. On the Sturm-Liouville Theory and the Eigenvalues of Intermediate Problems.. Numerische Mathematik, Tome 5 (1963), pp. 238-245. http://geodesic.mathdoc.fr/item/NUMA_1963__5_131571/