El-Ghazali Talbi Benjamin Weinberg Breaking the search space symmetry in partitioning problems: An application to the graph coloring problem. 78-86 2007 378 Theor. Comput. Sci. 1 http://dx.doi.org/10.1016/j.tcs.2007.01.023 db/journals/tcs/tcs378.html#TalbiW07