Press, pp. 547–559, MR 1957560 . ↑ Roussel, F.; Rusu, I.; Thuillier, H. (2009), "The strong perfect graph conjecture: 40 years of attempts, and its resolution", Discrete Mathematics, 309 (20): 6092–6113, doi:10.1016/j.disc.2009.05.024, MR 2552645 . ↑ Chudnovsky et al.