Evolutionary Computation in Combinatorial Optimization 19th European Conference, EvoCOP 2019, Held as Part of EvoStar 2019, Leipzig, Germany, April 24-26, 2019, Proceedings - Liefooghe, Arnaud; Liefooghe, Arnaud; Paquete, Luís; Paquete, Luís (Springer International Publishing : Imprint: Springer, 2019)