Athanasiadis, Christos A. “Power Sum Expansion of Chromatic Quasisymmetric Functions”. The Electronic Journal of Combinatorics 22, no. 2 (April 21, 2015): P2.7. Accessed March 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v22i2p7.