Collineations of the Subiaco generalized quadrangles. Payne, S.E. — 1994 Bulletin of the Belgian Mathematical Society - Simon Stevin
Isomorphisms between Subiaco q -clan geometries. Payne, S.E.; Penttila, Tim; Pinneri, Ivano — 1995 Bulletin of the Belgian Mathematical Society - Simon Stevin
On q -clan geometry, q = 2 e . Bader, L.; Lunardon, G; Payne, S.E. — 1994 Bulletin of the Belgian Mathematical Society - Simon Stevin
Half Moufang implies Moufang for finite generalized quadrangles. J.A. Thas; S.E. Payne; Van Maldeghem — 1991 Inventiones mathematicae