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References:
[1] M. Behzadand G. Chartrand: No graph is perfect. Amer. Math. Monthly 74(1967), 962-963. MR 0220627
[2] E. Harary: Graph Theory. Addison-Wesley, Reading 1969. MR 0256911 | Zbl 0196.27202
[3] E. A. Nordhaus, J. W. Gaddum: On the complementary graphs. Amer. Math. Monthly 63 (1956), 175-177. MR 0078685
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