@article{MAN_1917__78_158755,
     author = {E. Hilb},
     title = {Zur {Theorie} der linearen funktionalen {Differentialgleichungen.} {(Mit} 2 {Figuren} im {Text).}},
     journal = {Mathematische Annalen},
     pages = {137--170},
     publisher = {mathdoc},
     volume = {78},
     year = {1917},
     zbl = {46.0707.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1917__78_158755/}
}