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References:
[1] E. J. Cockayne S. T. Hedetniemi: Towards a theory of domination in graphs. Networks 7 (1977), 247-261. MR 0483788
[2] S. Poljak: Problem 6. Presented at the Czechoslovak Conference on Graph Theory at Zemplínska Šírava in 1978.
[3] B. Zelinka: Domatically critical graphs. Czech. Math. J. 30 (1980), 486-489. MR 0583627 | Zbl 0426.05046
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