Adaptive Operator Selection at the Hyper-level - Krempser, Eduardo; Fialho, Álvaro; Barbosa, Helio J. C. (Lecture Notes in Computer Science ; Parallel Problem Solving from Nature - PPSN XII ; page 378-387 ; ISSN 0302-9743 1611-3349 ; ISBN 9783642329630 9783642329647, 2012)