Kaul, Hemanshu, and Jeffrey A. Mudrock. “On the Alon-Tarsi Number and Chromatic-Choosability of Cartesian Products of Graphs”. The Electronic Journal of Combinatorics 26, no. 1 (January 11, 2019): P1.3. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v26i1p3.