Hybrid Metaheuristics: 9th International Workshop, HM 2014, Hamburg, Germany, June 11-13, 2014, Proceedings

Hybrid Metaheuristics: 8th International Workshop, HM 2013, Ischia, Italy, May 23-25, 2013. Proceedings

Hybrid Metaheuristics: 4th International Workshop,HM 2007, Dortmund, Germany, October 8-9, 2007, Proceedings

Swarm Intelligence: 12th International Conference, ANTS 2020, Barcelona, Spain, October 26–28, 2020, Proceedings