1. Modern Kaluza-Klein Theories;Appelquist,1987
2. Supergravity and Superstrings: A Geometric Perspective;Castellani,1991
3. The Meaning of Relativity;Einstein,1953
4. The Evolution of Physics;Einstein,1938
5. Nonlinear Oscillations, Dynamical Systems and Bifurcation of Vector Fields;Guckenheimer,2002