José R. Correa, Martin Skutella, José Verschae. The Power of Preemption on Unrelated Machines and Applications to Scheduling Orders. In Irit Dinur, Klaus Jansen, Joseph Naor, José D. P. Rolim, editors, Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques, 12th International Workshop, APPROX 2009, and 13th International Workshop, RANDOM 2009, Berkeley, CA, USA, August 21-23, 2009. Proceedings. Volume 5687 of Lecture Notes in Computer Science, pages 84-97, Springer, 2009. [doi]