@article{MAN_1900__53_157976,
     author = {H.E. Timerding},
     title = {Ueber die eindeutigen quadratischen {Transformationen} einer {Ebene}},
     journal = {Mathematische Annalen},
     pages = {193--219},
     publisher = {mathdoc},
     volume = {53},
     year = {1900},
     zbl = {31.0659.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1900__53_157976/}
}