Kachurik, I. I. “$q$-Numbers of Quantum Groups, Fibonacci Numbers, and Orthogonal Polynomials”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 50, no. 8, Aug. 1998, pp. 1055-63, https://umj.imath.kiev.ua/index.php/umj/article/view/4854.