1. M Rivas J. Math. Phys. 30 318 (1989)
2. M Rivas Kinematical Theory of Spinning Particles. Classical and Quantum Mechanical Formalism of Elementary Particles Fundamental Theories of Physics Series, vol. 116 (Dordrecht: Kluwer) (2001) An updated version of the formalism can be obtained as the Lecture Notes: https://www.researchgate.net/publication/337744818\_Kinematical\_theory \_of\_elementary\_spinning\_particles
3. ALPHA collaboration Nature 578 375 (2020)
4. R F Streater and A S Wightman PCT, Spin & Statistics, and all that (New York:Benjamin) p 29 (1964)
5. See reference [2], p 148-151 (2001)