@article{MAN_1912__71_158518,
     author = {E. Hilb},
     title = {\"Uber {Reihenentwicklungen} nach den {Eigenfunktionen} linearer {Differentialgleichungen} 2ter {Ordnung}},
     journal = {Mathematische Annalen},
     pages = {76--87},
     publisher = {mathdoc},
     volume = {71},
     year = {1912},
     zbl = {42.0327.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1912__71_158518/}
}