1. Algebraic Models in Geometry;Felix,2008
2. Die lineale Ausdehnungslehre;Grassmann,1995
3. The dialectics of mind;Hoffman;Journal of Mind Theory,2012
4. Symmetry-curvature duality;Leyton;Computer Vision, Graphics and Image Processing,1987
5. Symmetry, Causality, Mind;Leyton,1999