1. Electromagnetic force and geometry of Minkowskian spacetime
2. Spinors and Space-Time
3. A. Bette and J. Buitrago, XIXth Max Born Symposium: Fundamental Interactions and Twistor-like Methods, American Institute of Physics Conference Proceedings No. 767 (American Institute of Physics, Melville, NY, 2005), pp. 28–44.
4. A. Bette, Twistors, Special Relativity, Conformal Symmetry and Minimal Coupling—A Review, Reporte de Investigacion No. 26, Septiembre 2003, Universidad de Sonora, Division de Ciencias Exactas y Naturales, Rosales y Blvd. Luis Encinas J., Edif. 3K1, 83000 Hermosillo, Sonora, Mexico, 2003.
5. Cambridge Monographs on Mathematical Physics;Stewart J.,1990