Aharoni, Ron, Eli Berger, Maria Chudnovsky, Frédéric Havet, and Zilin Jiang. “Cooperative Colorings of Trees and of Bipartite Graphs”. The Electronic Journal of Combinatorics 27, no. 1 (February 7, 2020): P1.41. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i1p41.