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Cook, L., Masařík, T., Pilipczuk, M., Reinald, A. and Souza, U.S. 2023. Proving a Directed Analogue of the Gyárfás-Sumner Conjecture for Orientations of $P_4$. The Electronic Journal of Combinatorics. 30, 3 (Sep. 2023), P3.36. DOI:https://doi.org/10.37236/11538.