Sereni, Jean-Sébastien, and Zelealem B. Yilma. “The Number of Spanning Trees in 4-Regular Simple Graphs”. The Electronic Journal of Combinatorics 31, no. 4 (November 29, 2024): P4.50. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v31i4p50.