Guo, Victor J. W. “The $q$-Binomial Theorem and Two Symmetric $q$-Identities”. The Electronic Journal of Combinatorics 10, no. 1 (September 12, 2003): R34. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v10i1r34.