1. Chew, C.S., Kong, O.C.W., Payne, J.: A quantum space behind simple quantum mechanics advances in high energy physics 2017, special issue on planck-scale deformations of relativistic symmetries, Article ID 4395918, 1–9 (2017)
2. Chew, C.S., Kong, O.C.W., Payne, J.: Observables and dynamics, quantum to classical, from a relativity symmetry perspective, NCU-HEP-k070 (2018) submitted; moreover, see the references therein
3. Inönü, E., Wigner, E.P.: On the Contraction of Groups and their Representations. Proc. Nat. Acad. Sci. (US) 39, 510–524 (1953). See also and E. Saletan, Contraction of Lie Groups, J. Math. Phys. 2 (1961) 1–21
4. Gilmore, R.: Lie groups, Lie algebras, and some of their applications, Dover (2005)
5. Kong, O.C.W., Payne, J.: The Newtonian limit of special relativity: A relativity symmetry contraction perspective, NCU-HEP-k067 (2018)