@article{MAN_1926__95_159135,
     author = {H. Geppert},
     title = {\"Uber eine {Verallgemeinerung} der linearen {Randwertprobleme}},
     journal = {Mathematische Annalen},
     pages = {368--388},
     publisher = {mathdoc},
     volume = {95},
     year = {1926},
     zbl = {51.0341.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1926__95_159135/}
}