Concerning the achromatic number of graphs
Journal of Combinatorial Theory Series B
Discrete Applied Mathematics
Achromatic number is NP-complete for cographs and interval graphs
Information Processing Letters
Some complexity results about threshold graphs
Discrete Applied Mathematics - Special volume: viewpoints on optimization
The complexity of harmonious colouring for trees
Discrete Applied Mathematics - Special issue: Combinatorial Optimization 1992 (CO92)
Discrete Applied Mathematics
Some results on the achromatic number
Journal of Graph Theory
Recognizing cographs and threshold graphs through a classification of their edges
Information Processing Letters
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
On the k-path partition of graphs
Theoretical Computer Science
Parallel algorithms for Hamiltonian problems on quasi-threshold graphs
Journal of Parallel and Distributed Computing
Algorithmic Graph Theory and Perfect Graphs (Annals of Discrete Mathematics, Vol 57)
Algorithmic Graph Theory and Perfect Graphs (Annals of Discrete Mathematics, Vol 57)
Note: The harmonious coloring problem is NP-complete for interval and permutation graphs
Discrete Applied Mathematics
Harmonious coloring on subclasses of colinear graphs
WALCOM'10 Proceedings of the 4th international conference on Algorithms and Computation
Harmonious chromatic number of directed graphs
Discrete Applied Mathematics
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Extending previous NP-completeness results for the harmonious coloring problem and the pair-complete coloring problem on trees, bipartite graphs and cographs, we prove that these problems are also NP-complete on connected bipartite permutation graphs. We also study the k-path partition problem and, motivated by a recent work of Steiner [G. Steiner, On the k-path partition of graphs, Theoret. Comput. Sci. 290 (2003) 2147-2155], where he left the problem open for the class of convex graphs, we prove that the k-path partition problem is NP-complete on convex graphs. Moreover, we study the complexity of these problems on two well-known subclasses of chordal graphs namely quasi-threshold and threshold graphs. Based on the work of Bodlaender [H.L. Bodlaender, Achromatic number is NP-complete for cographs and interval graphs, Inform. Process. Lett. 31 (1989) 135-138], we show NP-completeness results for the pair-complete coloring and harmonious coloring problems on quasi-threshold graphs. Concerning the k-path partition problem, we prove that it is also NP-complete on this class of graphs. It is known that both the harmonious coloring problem and the k-path partition problem are polynomially solvable on threshold graphs. We show that the pair-complete coloring problem is also polynomially solvable on threshold graphs by describing a linear-time algorithm.