Approximation, Randomization and Combinatorial Optimization: Algorithms and Techniques 4th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems, APPROX 2001 and 5th International Workshop on Randomization and Approximation Techniques in Computer Science, RANDOM 2001 Berkeley, CA,USA, August 18-20, 2001 - Goemans, Michel; Goemans, Michel; Jansen, Klaus; Jansen, Klaus; Rolim, Jose D.P; Rolim, Jose D.P; Trevisan, Luca; Trevisan, Luca (Springer Berlin Heidelberg : Imprint: Springer, 2001)