Acyclic subgraphs with high chromatic number. - Safwat Nassar; Raphael Yuster (Eur. J. Comb., 2019)

All Feedback Arc Sets of a Random Turán Tournament Have $ lfloor {n}/{k} floor-{k}+1$ Disjoint k-Cliques (and This Is Tight). - Safwat Nassar; Raphael Yuster (SIAM J. Discret. Math., 2021)