1. On the nonexistence of certain planar spaces;Brouwer,1978
2. Espaces linéaires finis à plans isomorphes;Buekenhout;Bull. Soc. Math. Belg.,1971
3. Finite planar spaces with isomorphic planes;Delandtsheer;Discrete Math.,1982
4. Finite π-spaces;Leonard;Geometriae Dedicata,1982