@article{MAN_1935__110_159729,
     author = {J. von Schwarz},
     title = {Das {Delaunaysche} {Problem} der {Variationsrechnung} in kanonischen {Koordinaten}},
     journal = {Mathematische Annalen},
     pages = {357--389},
     publisher = {mathdoc},
     volume = {110},
     year = {1935},
     zbl = {0010.06704},
     url = {http://geodesic.mathdoc.fr/item/MAN_1935__110_159729/}
}