On the orbits of Singer groups and their subgroups. Drudge, Keldon (2002) The Electronic Journal of Combinatorics [electronic only]
On the proof of a theorem of Pálfy. Dobson, Edward (2006) The Electronic Journal of Combinatorics [electronic only]
On the Structure of Finite Collineation Groups Containing Symmetries of Generalized Quadrangles. Michael Walker (1977) Inventiones mathematicae