Duraj, Lech, Grzegorz Gutowski, and Jakub Kozik. “Chip Games and Paintability”. The Electronic Journal of Combinatorics 23, no. 3 (July 8, 2016): P3.3. Accessed April 3, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i3p3.