@article{MZ_1943__49_169045,
     author = {M.J.O Strutt},
     title = {Reelle {Eigenwerte} verallgemeinerter {Hillscher} {Eigenwertaufgaben} 2. {Ordnung}},
     journal = {Mathematische Zeitschrift},
     pages = {593--643},
     publisher = {mathdoc},
     volume = {49},
     year = {1943},
     zbl = {0063.07221},
     url = {http://geodesic.mathdoc.fr/item/MZ_1943__49_169045/}
}