@article{JDM_1908__17_145132,
     author = {E.B. Wilson},
     title = {The {Number} of {Types} of {Collineations.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {341--344},
     publisher = {mathdoc},
     volume = {17},
     year = {1908},
     zbl = {39.0205.01},
     url = {http://geodesic.mathdoc.fr/item/JDM_1908__17_145132/}
}