@article{MAN_1922__86_158948,
     author = {C. Carath\'eodory},
     title = {\"Uber ein {Reziprozit\"atsgesetz} der verallgemeinerten {Legendreschen} {Transformation}},
     journal = {Mathematische Annalen},
     pages = {272--275},
     publisher = {mathdoc},
     volume = {86},
     year = {1922},
     zbl = {48.0588.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1922__86_158948/}
}