Andrea Di Blas Arun Jagota Richard Hughey A Range-Compaction Heuristic for Graph Coloring. 489-506 2003 9 J. Heuristics 6 http://dx.doi.org/10.1023/B:HEUR.0000012448.70007.32 db/journals/heuristics/heuristics9.html#BlasJH03