Ducey, Joshua E., Jonathan Gerhard, and Noah Watson. “The Smith and Critical Groups of the Square Rook’s Graph and Its Complement”. The Electronic Journal of Combinatorics 23, no. 4 (October 14, 2016): P4.9. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i4p9.