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 2001, proceedings - Goemans, Michel. (Lecture notes in computer science, 2001)