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Proceedings of the IEEE > 2012 > 100 > 1 > 107 - 121
Data & Knowledge Engineering > 2010 > 69 > 1 > 137-152
Journal of Discrete Algorithms > 2007 > 5 > 4 > 662-681
Journal of Computational and Applied Mathematics > 2002 > 142 > 1 > 27-37