@article{MAN_1959__139_160743,
     author = {M. HERRMANN},
     title = {Eine {Bemerkung} \"uber {Pl\"uckersche} {\"Aquivalenzzahlen.}},
     journal = {Mathematische Annalen},
     pages = {180--183},
     publisher = {mathdoc},
     volume = {139},
     year = {1959},
     zbl = {0094.34204},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__139_160743/}
}