Anupam Gupta, Klaus Jansen, José D. P. Rolim, Rocco A. Servedio: Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques - 15th International Workshop, APPROX 2012, and 16th International Workshop, RANDOM 2012, Cambridge, MA, USA, August 15-17, 2012. Proceedings. Lecture Notes in Computer Science 7408, Springer 2012, ISBN 978-3-642-32511-3