1. Über homomorphismen projektiver Ebenen;André;Abh. Math. Semin. Univ. Hambg.,1969
2. Handbook of Incidence Geometry, Buildings and Foundations;Buekenhout,1995
3. Homomorphisms of Moufang planes and alternative places;Faulkner;Geom. Dedicata,1983
4. Points and Lines. Characterizing the Classical Geometries;Shult,2011
5. Homomorphisms of projective planes and T-homomorphisms of ternaries;Skornjakov;Mat. Sb.,1957