1. I. Angiono, H. Yamane, J. Math. Phys. 56 (2015): 021702.
2. G. Benkart, S. Witherspoon, Algeb. Represent. Theory 7, no. 3 (2004): 261–286.
3. G. Benkart, S. Witherspoon, Hopf algebras, Lecture Notes in Pure and Appl. Math., vol. 237, Dekker, New York, 2004, 65–92.
4. J. Ding, I. Frenkel, Commun. Math. Phys. 156, no. 2 (1993): 277–300.
5. L. Faddeev, N. Reshetikhin, L. Takhtajan, Leningrad Math. J. 1 (1990): 193–225.