@article{MZ_1965__89_170434,
     author = {F.C. Piper},
     title = {Collineation groups containing elations. {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {181--191},
     publisher = {mathdoc},
     volume = {89},
     year = {1965},
     zbl = {0189.20803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__89_170434/}
}