1. Abraham M. (1905), “Theorie der Electrizität”, Teubner, Leipzig; Abraham M. and Lorentz H. A. (1909), “Theorie der Electrizität”, Teubner, Leipzig.
2. Ahlfors L. and Lounesto P. (1989), Some remarks on Clifford algebrasComplex Variables 12 201–209.
3. Altmann S. L. (1986), “Rotations, Quaternions and Double Groups”, Oxford, Clarendon Press.
4. Artin E. (1957), “Geometric Algebra”, New York Interscience.
5. Atiyah M. F., Bott R. and Shapiro A. (1964), Clifford modulesTopology 3 (Suppl. 1) 3–38.