Approximation, Randomization and Combinatorial Optimization. Algorithms and Techniques : 8th International Workshop on Approximation Algorithms for Compinatorial Optimization Problems, APPROX 2005 and 9th International Workshop on Randomization and Computation, RANDOM 2005, Berkeley, CA, USA, August 22-24, 2005, Proceedings - Chandra Chekuri, Klaus Jansen, José D. P. Rolim, Luca Trevisan ((Lecture Notes in Computer Science))