Dekking, F. Michel, Jeffrey Shallit, and N. J. A. Sloane. “Queens in Exile: Non-Attacking Queens on Infinite Chess Boards”. The Electronic Journal of Combinatorics 27, no. 1 (March 6, 2020): P1.52. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i1p52.