Approximation, Randomization, and Combinatorial Optimization Algorithms and Techniques: 6th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems, APPROX 2003, and 7th International Workshop on Randomization and Approximation Techniques in Computer Science, RANDOM 2003, Princeton, NJ, USA, August 24-26, 2003: Proceedings - Arora, Sanjeev (Lecture Notes in Computer Science Ser.)