Günther R. Raidl, Jakob Puchinger, Christian Blum. Metaheuristic Hybrids. Chapter in Handbook of Metaheuristics (Michel Gendreau, Jean Yves Potvin, eds.), pages 385–417, 2019, Springer. (Note: previous technical report version at https://www.ac.tuwien.ac.at/files/pub/raidl-19.pdf)