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Publikováno v:
Discrete Mathematics. 243(1-3):241-252
The concept of the (integral) sum graphs was introduced by Harary (Congr. Numer. 72 (1990) 101; Discrete Math. 124 (1994) 99). Let N(Z) denote the set of all positive integers(integers). The (integral) sum graph of a finite subset S⊂N(Z) is the gra
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