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References:
[1] AKIYAMA J., EXOO G., HARARY R.: Covering and packing in gгaphs III: Cyclic and acyclic invariants. Math. Slovaca 30, 1980, 405-417. MR 0595302
[2] COCKAYNE E. J., HEDETNIEMI S. T.: Towaгds a theoгy of domination in gгaphs. Netwoгks 7, 1977, 247-261. MR 0483788
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