Waihangahia he putanga matatini ake o tēnei rerenga M.Stroppel 1995'' Compact Projective Planes ', W. de Gruyter 87.7.
O te akoranga, he putanga atu matatini o te rerenga ko "M.Stroppel 1995 '' Compact Projective Planes ',' W. de Gruyter Chapter 8 me tata i roto i H. Salzmann 2014'' Compact rererangi, te nuinga 8 - ahu. "