Shirazi, Hamed, and Jacques Verstraëte. “A Note on Polynomials and $f$-Factors of Graphs”. The Electronic Journal of Combinatorics 15, no. 1 (June 20, 2008): N22. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v15i1n22.