Gerbner, Dániel, Andrzej Grzesik, Cory Palmer, and Magdalena Prorok. “Directed Graphs Without Rainbow Stars”. The Electronic Journal of Combinatorics 31, no. 4 (December 17, 2024): P4.70. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v31i4p70.