L. Cayuela, Álvaro Alonso, J. A. Blanco, C. Puerta-Piñero, S. Rodríguez-Echeverría, and L. Jiménez-Eguizabal, “How close are we to achieving the targets proposed?”, ECOS, vol. 23, no. 1, pp. 61–63, Apr. 2014.