@article{MAN_1937__113_159870,
     author = {H. Welker},
     title = {Allgemeine {Koordinaten} und {Bedingungsgleichungen} in der {Wellenmechanik.}},
     journal = {Mathematische Annalen},
     pages = {CCCIV--CCCXIX},
     publisher = {mathdoc},
     volume = {113},
     year = {1937},
     url = {http://geodesic.mathdoc.fr/item/MAN_1937__113_159870/}
}