P. Gonzalez-Nalda, I. Calvo, I. Etxeberria-Agiriano, A. García-Ruíz, S. Martínez-Lesta, and D. Caballero-Martín, “Building a CPS as an Educational Challenge”, Int. J. Onl. Eng., vol. 10, no. 4, pp. pp. 52–58, Jun. 2014.