Parallel Problem Solving from Nature - PPSN XV 15th International Conference, Coimbra, Portugal, September 8-12, 2018, Proceedings, Part I - Auger, Anne; Auger, Anne; Fonseca, Carlos M.; Fonseca, Carlos M.; Lourenço, Nuno; Lourenço, Nuno; Machado, Penousal; Machado, Penousal; Paquete, Luís; Paquete, Luís; Whitley, Darrell; Whitley, Darrell (Springer International Publishing : Imprint: Springer, 2018)