Duncan Campbell, Keith Edwards. A new lower bound for the harmonious chromatic number. Australasian J. Combinatorics, 29:99-102, 2004. [doi]
@article{CampbellE04, title = {A new lower bound for the harmonious chromatic number}, author = {Duncan Campbell and Keith Edwards}, year = {2004}, url = {http://ajc.maths.uq.edu.au/pdf/29/ajc_v29_p099.pdf}, researchr = {https://researchr.org/publication/CampbellE04}, cites = {0}, citedby = {0}, journal = {Australasian J. Combinatorics}, volume = {29}, pages = {99-102}, }