@article{GDZPPN002396106, title = {Collineation groups containing elations. I.}, journal = {Mathematische Zeitschrift}, volume = {87}, year = {1965}, pages = {181-191}, zbl = {0189.20803}, url = {http://dml.mathdoc.fr/item/GDZPPN002396106} }
Piper, F.C. Collineation groups containing elations. I.. Mathematische Zeitschrift, Tome 87 (1965) pp. 181-191. http://gdmltest.u-ga.fr/item/GDZPPN002396106/