@article{GDZPPN00239975X, title = {Zur Spektraltheorie von Sturm-Liouville-Operatoren.}, journal = {Mathematische Zeitschrift}, volume = {99}, year = {1967}, pages = {268-302}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN00239975X} }
Weidmann, Joachim. Zur Spektraltheorie von Sturm-Liouville-Operatoren.. Mathematische Zeitschrift, Tome 99 (1967) pp. 268-302. http://gdmltest.u-ga.fr/item/GDZPPN00239975X/