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@article{IM_1977__40_142480, author = {Michael Walker}, title = {On the {Structure} of {Finite} {Collineation} {Groups} {Containing} {Symmetries} of {Generalized} {Quadrangles.}}, journal = {Inventiones mathematicae}, pages = {245--266}, publisher = {mathdoc}, volume = {40}, year = {1977}, zbl = {0367.05017}, url = {http://geodesic.mathdoc.fr/item/IM_1977__40_142480/} }
Michael Walker. On the Structure of Finite Collineation Groups Containing Symmetries of Generalized Quadrangles.. Inventiones mathematicae, Tome 40 (1977), pp. 245-266. http://geodesic.mathdoc.fr/item/IM_1977__40_142480/