Guo VJW, Zeng J. Combinatorial Proof of a Curious $q$-Binomial Coefficient Identity. Electron. J. Combin. [Internet]. 2010Feb.8 [cited 2026Mar.30];17(1):N13. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1n13