@article{GDZPPN002093383,
title = {On the Structure of Finite Collineation Groups Containing Symmetries of Generalized Quadrangles.},
journal = {Inventiones mathematicae},
volume = {41},
year = {1977},
pages = {245-266},
zbl = {0367.05017},
url = {http://dml.mathdoc.fr/item/GDZPPN002093383}
}
Walker, Michael. On the Structure of Finite Collineation Groups Containing Symmetries of Generalized Quadrangles.. Inventiones mathematicae, Tome 41 (1977) pp. 245-266. http://gdmltest.u-ga.fr/item/GDZPPN002093383/