Variants of the Gyárfás–Sumner conjecture: Oriented trees and rainbow paths - Basavaraju, Manu; Chandran, L. Sunil; Francis, Mathew C.; Murali, Karthik (Journal of graph theory, 2025)
Keywords: Apexes; chromatic number; Gallai–Roy–Vitaver theorem; Graph theory; Graphs; Gyárfás–Sumner conjecture; induced oriented trees; induced rainbow paths; Integers; Polytrees; Trees (mathematics); Upper bounds