16-dimensional compact projective planes with 3 fixed points. Salzmann, H. (2003) Advances in Geometry
*-autonomous categories: Once more around the track. Barr, Michael (1999) Theory and Applications of Categories [electronic only]
Гомоморфизмы и алгоритмические проблемы в проективных плоскостях. В.В. Вдовин (1991) Sibirskij matematiceskij zurnal