González D’León, Rafael S. “A Note on the $\gamma$-Coefficients of the Tree Eulerian Polynomial”. The Electronic Journal of Combinatorics 23, no. 1 (February 5, 2016): P1.20. Accessed April 5, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i1p20.