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References:
[1] M. Behzad G. Chartrand: No graph is perfect. Amer. Math. Monthly 74 (1967), 962-963. MR 0220627
[2] M. Behzad G. Chartrand: Introduction to the Theory of Graphs. Allyn and Bacon, Inc., Boston 1971. MR 0432461
[3] /. Sedláček: O perfektních a kvaziperfektních grafech. Čas. pěst. mat. 100 (1975), 135 - 141. MR 0416994
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