Approximation, Randomization and Combinatorial Optimization. Algorithms and Techniques : 7th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems, APPROX 2004 and 8th International Workshop on Randomization and Computation, RANDOM 2004, Cambridge, MA, USA August 22-24, 2004 , Proceedings - Klaus Jansen, Sanjeev Khanna, José D. P. Rolim, Dana Ron ((Lecture Notes in Computer Science))