1. Models of the Real Projective Plane: Computer Graphics of Steiner and Boy Surfaces;Apery,1987
2. Introduction to Higher Algebra;Bocher,1964
3. Geometric Concepts for Geometric Design;Boehm,1994
4. Multidimensional Analytic Geometry;Borsuk,1969
5. A Long Way From Euclid;Coolidge,1963