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![Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques 12th International Workshop, APPROX 2009, and 13th Internatio [Paperback]](/itemImage/2/6/1/2/2_5259212.jpg "Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques 12th International Workshop, APPROX 2009, and 13th Internatio [Paperback]")