Li, Shuchao, and Zhongxun Zhu. “Sharp Lower Bound for the Total Number of Matchings of Tricyclic Graphs”. The Electronic Journal of Combinatorics 17, no. 1 (October 5, 2010): R132. Accessed March 30, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1r132.