Quick retrieval of effective electromagnetic metamaterial parameters by using a Multi-fidelity Surrogate Modelling approachGiovanni Angiulli, Mario Versaci, Salvatore Calcagno and Paolo Di BarbaEur. Phys. J. Appl. Phys., 90 2 (2020) 20901DOI: https://doi.org/10.1051/epjap/2020200014