1. M.F. Atiyah, R. Bott, A. Shapiro: Clifford modules. Topology 3, suppl. 1 (1964), 3–38. Reprinted in R. Bott: Lectures on K(X). Benjamin, New York, 1969, pp. 143–178.
2. Reprinted in Michael Atiyah: Collected Works, Vol. 2. Clarendon Press, Oxford, 1988, pp. 301–336.
3. W. Baylis: Theoretical Methods in the Physical Science: an introduction to problem solving using MAPLE V. Birkhäuser, Boston, 1994.
4. I. M. Benn, R. W. Tucker: An Introduction to Spinors and Geometry with Applications in Physics. Adam Hilger, Bristol, 1987.
5. J.D. Bjorken, S.D. Drell: Relativistic Quantum Mechanics. McGraw-Hill, New York, 1964.