@article{MAN_1959__139_160748,
     author = {O.-H. KELLER},
     title = {Zur {Theorie} der ebenen birationalen {Ber\"uhrungstransformationen} {III.} {Der} {Grad} der {Bildkurven.}},
     journal = {Mathematische Annalen},
     pages = {239--254},
     publisher = {mathdoc},
     volume = {139},
     year = {1959},
     zbl = {0104.39001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__139_160748/}
}