Every (P2∪P4, bull)-free graph with clique number at least 3 and no homogeneous set admits a perfect division.
Gy\' a rf\' a s, Problems from the world surrounding perfect graphs, Zastos
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Perfect divisions in ($P_2 \cup P_4$, bull)-free graphs
Every (P2∪P4, bull)-free graph with clique number at least 3 and no homogeneous set admits a perfect division.