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References:
[1] AKIYAMA J., EXOO G., HARARY F.: Coveгing and packiпg in graphs III: Cyclic and acyclic invariants. Math. Slovaca 30, 1980, 405-417. MR 0595302
[2] HARARY F.: Coveгing and packing in graphs I. Ann New Yoгk Acad. Sci. 175, 1970, 198-205. MR 0263677
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