1. Ablamowicz Rafal, Zbigniew Oziewicz and Jan Rzewuski: 1982, ’Clifford algebra approach to twistors’, J. Math. Phys. 23, 231–242
2. Chevalley Claude: 1954, The Algebraic Theory of Spinors, Columbia University Press, New York, 38–42
3. Crumeyrolle, A.: 1990, Orthogonal and Symplectic Clifford Algebras. Spinor Structures, Kluwer A.P.: Dordrecht
4. Fock V. and D. Ivanenko: 1929, C.R. Acad. Sci. (Paris) 188, 1470
5. Hestenes David: 1966, Space-Time Algebra, Gordon and Breach, 26 and 64