David Travieso García Associate Professor Universidad Autónoma de Madrid INFO David M. Jacobs Associate Professor Universidad Autónoma de Madrid INFO María Pilar Aivar Rodríguez Associate Professor Universidad Autónoma de Madrid INFO Lorena Lobo UAM INFO Alejandro Díaz UNED INFO Jorge Ibañez Gijón CNRS Marseille INFO Alfredo Higueras Student UAM INFO Luis Gómez Student UAM INFO