1. Hestenes, D.: Spacetime physics with geometric algebra. Am. J. Phys. 71, 691–704 (2003)
2. Hestenes, D.: Mysteries and insights of Dirac theory. Ann. Fond. Louis Broglie 28, 390–408 (2003)
3. Advances in Applied Clifford Algebras;D. Hestenes,1997
4. Bender, D., et al.: Tests of QED at 29 GeV center-of-mass energy. Phys. Rev. D 30, 515 (1984)
5. Bohm, D., Hiley, B.: The Undivided Universe, an Ontological Interpretation of Quantum Theory, 2nd edn. Routledge, London (1993), p. 220