Harmonious Labelings of Cj∪Ck∪Cl
The disjoint union Cj∪Ck∪Cl is component of three cycles Cj, Ck and Cl. In this paper, we show that the disjoint union graph Cj∪Ck∪Cl is harmonious for odd j+k+l with l ≥j + k + 5.
J. Xi "Harmonious Labelings of Cj∪Ck∪Cl", Advanced Materials Research, Vol. 304, pp. 345-349, 2011