Dèan dreach nas iom-fhillte den abairt seo M.Stroppel 1995'' Compact Projective Planes ', W. de Gruyter 87.7.
Gu dearbh, is e dreach nas iom-fhillte den abairt "M.Stroppel 1995 '' Compact Projective Plans ',' W. de Gruyter Caibideil 8 agus nas ùire ann an H. Salzmann 2014'' Compact planaichean, sa mhòr-chuid 8 -dimensional. "