Partial Spreads, Packings and Hermitian Manifolds in PG (3, q). Aiden A. Bruen, Joseph Adolphe Thas (1976) Mathematische Zeitschrift
Perspectivities in Irreducible Collineation Groups of Projective Planes. I. Christoph Hering, Michael Walker (1977) Mathematische Zeitschrift
Piani di traslazione derivabili Guglielmo Lunardon (1979) Rendiconti del Seminario Matematico della Università di Padova
Plans projectifs d'ordre 16 ayant un groupe de Frobenius d'ordre. Tran van Trung (1980) Mathematische Zeitschrift
Projective bundles. Baker, R.D., Brown, J.M.N., Ebert, G.L., Fisher, J.C. (1994) Bulletin of the Belgian Mathematical Society - Simon Stevin
Projective planes of order 10 do not have a collineation of order 3. Zvonimir Janko, Tran von Trung (1981) Journal für die reine und angewandte Mathematik
Projective planes of order 12 do not have a non-abelian group of order 6 as a collineation group. Zvonimir Janko, Tran van Trung (1981) Journal für die reine und angewandte Mathematik