Martin, Ryan, and Yi Zhao. “Tiling Tripartite Graphs With $3$-Colorable Graphs”. The Electronic Journal of Combinatorics 16, no. 1 (August 31, 2009): R109. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1r109.