@university of Pavia Italy
Technical University Munich Germany - Munich
@ras-ufcg Campina Grande, PB
Beijing University of Technology Beijing University of Technology
@Lesf-Unicamp
Agronomic and Veterinary Institute Hassan II - IAVH II Rabat, Morocco
China University of mining and technology china
@Math-at-Aalborg-University Denmark
Universidad Tecnológica de Panamá Panama City, Panama.