Abuur nooc ka sii adag weedhan M.Stroppel 1995'' Compact Projective Planes ', W. de Gruyter 87.7.
Dabcan, nooc ka mid ah weedhan ka sii adag waa "M.Stroppel 1995 '' Compact Projective Planes ',' W. de Gruyter Cutubka 8 iyo dhowaan H. Salzmann 2014'' Compact planes, inta badan 8 -dimensional. "