@article{MAN_1905__61_158243,
     author = {Paul Gordan},
     title = {Die partiellen {Differentialgleichungen} des {Valentinerproblems}},
     journal = {Mathematische Annalen},
     pages = {453--526},
     publisher = {mathdoc},
     volume = {61},
     year = {1905},
     zbl = {37.0142.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1905__61_158243/}
}