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2. M.E. Peskin, D.V. Schroeder, An Introduction to Quantum Field Theory (Westview Press, 1995)
3. N.N. Bogoliubov, D.V. Shirkov, Introduction to the Theory of Quantized Fields (Interscience Publisher, New York, 1959)
4. H.B. Lawson Jr., M.-L. Michelsohn, Spin Geometry (Princeton University Press, Princeton, 1989)
5. J. Vaz Jr., R. da Rocha Jr., An Introduction to Clifford Algebras and Spinors (Oxford University Press, Oxford, 2016)