1. New upper bounds on harmonious colourings;Edwards;J. Graph Theory,1994
2. The line-distinguishing chromatic number of a graph;Frank;Ars Combin.,1982
3. Computers and Intractability;Garey,1980
4. On the harmonious coloring of graphs;Hopcroft;SIAM J. Algebraic Discrete Methods,1983
5. Line distinguishing and harmonious colourings;Wilson,1990