Hybrid Metaheuristics 4th International Workshop, HM 2007, Dortmund, Germany, October 8-9, 2007. Proceedings - Bartz-Beielstein, Thomas; Blesa Aguilera, María José; Blum, Christian; Naujoks, Boris; Roli, Andrea; Rudolph, Günter; Sampels, Michael (Springer Berlin Heidelberg, 2007)