- [Rocek1991]: M. Roček: Representation theory of the nonlinear SU (2) algebra; Physics Letters B, Volume 255, Issue 4, 21 February 1991, Pages 554-557; – URL:
- Abstract: A deformed quadratic Casimir operator is constructed for nonlinearly deformed SU (2) algebras, and the representation theory is investigated. Different deformations give rise to different kinds of finite dimensional unitary representations, including periodic representations as in quantum groups, as well as extra, truncated and missing representations. Remarkably, certain deformations allow only finite numbers of unitary representations (maximum spin representations). A free oscillator representation is given.