@article{CMH_1943__16_138832,
     author = {E. Makai},
     title = {\"Uber die {Nullstellen} von {Funktionen,} die {L\"osungen} {Sturm-Liouville'scher} {Differentialgleichungen} sind.},
     journal = {Commentarii mathematici Helvetici},
     pages = {153--199},
     publisher = {mathdoc},
     volume = {16},
     year = {1943},
     zbl = {0061.14009},
     url = {http://geodesic.mathdoc.fr/item/CMH_1943__16_138832/}
}