1. Embedding finite linear spaces in projective planes;Beutelspacher;Ann. Discrete Math.,1986
2. An improved bound for extending partial projective planes;Dow;Discrete Math.,1983
3. Endliche [0,2]-Ebenen;Hauptmann;Geom. Dedicata,1980
4. On [0,2]-semiaffine planez;Lo Re;Simon Stevin,1986