Christian Blum Carlos Cotta Antonio J. Fernández José E. Gallardo Monaldo Mastrolilli Hybridizations of Metaheuristics With Branch & Bound Derivates. 85-116 2008 Hybrid Metaheuristics http://dx.doi.org/10.1007/978-3-540-78295-7_4 series/sci/2008-114 db/series/sci/sci114.html#BlumCFGM08