Mixer, Mark, Daniel Pellicer, and Gordon Williams. “Minimal Covers of the Archimedean Tilings, Part II”. The Electronic Journal of Combinatorics 20, no. 2 (April 24, 2013): P20. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v20i2p20.