@article{MAN_1936__112_159827,
     author = {H. Nagel},
     title = {\"Uber die aus quadrierbaren {Hermiteschen} {Matrizen} entstehenden {Operatoren}},
     journal = {Mathematische Annalen},
     pages = {247--285},
     publisher = {mathdoc},
     volume = {112},
     year = {1936},
     zbl = {0013.30804},
     url = {http://geodesic.mathdoc.fr/item/MAN_1936__112_159827/}
}