Chaiken, Seth, Christopher R. H. Hanusa, and Thomas Zaslavsky. “A $q$-Queens Problem. I. General Theory”. The Electronic Journal of Combinatorics 21, no. 3 (August 28, 2014): P3.33. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i3p33.