Mepụta ụdị dị mgbagwoju anya nke ahịrịokwu a M.Stroppel 1995'' Compact Projective Planes ', W. de Gruyter 87.7.
N'ezie, ihe dị mgbagwoju anya nke ahịrịokwu ahụ bụ "M.Stroppel 1995 '' Compact Projective Planes ',' W. de Gruyter Isi nke 8 na nso nso a na H. Salzmann 2014'' Compact planes, mostly 8-dimensional. "