Yu, Yuantian, and Shuchao Li. “On the $A_{\alpha}$-Index of $C_4$-Free Graphs With Given Order or Size”. The Electronic Journal of Combinatorics 32, no. 2 (May 13, 2025): #P2.23. Accessed April 19, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i2p23.