Characterization of epimorphisms of nets by normal decompositions Jaroslava Jachanová (1977) Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika
Compact 16-dimensional Projective Planes with Large Collineation Groups. II. Helmut Salzmann (1983) Monatshefte für Mathematik
Compact Disconnected Planes, Inverse Limits and Homomorphisms. Theo Grundhöfer (1988) Monatshefte für Mathematik
Construction of one epimorphism of projective planes over Cartesian groups Alena Vanžurová (1988) Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica