Földes & Hammer (1977a); Golumbic (1980), Theorem 6.3, p. 151. Földes, Stéphane; Hammer, Peter Ladislaw (1977a), "Split graphs", Proceedings of the Eighth Southeastern Conference on Combinatorics, Graph Theory and Computing (Louisiana State Univ., Baton Rouge, La., 1977), Congressus Numerantium, vol. XIX, Winnipeg: Utilitas Math., pp. 311–315, MR0505860. Golumbic, Martin Charles (1980), Algorithmic Graph Theory and Perfect Graphs, Academic Press, ISBN0-12-289260-7, MR0562306.