@article{MAN_1898__50_157897,
     author = {W. Ahrens},
     title = {Ueber discrete {Schaaren} von continuirlichen {Transformationen}},
     journal = {Mathematische Annalen},
     pages = {518--524},
     publisher = {mathdoc},
     volume = {50},
     year = {1898},
     zbl = {29.0323.05},
     url = {http://geodesic.mathdoc.fr/item/MAN_1898__50_157897/}
}