Open educational resources in higher education: cases from Latin America and Europe by Santos, A, Cobo, C, Costa, C, Aguilar, J, Cabrera, M, Cadme, E, Castro, V, Chicaiza, J, Jara, I, Lane, A, Maina, M, Mancebo, R, Mariano, S, Pérez-Mateo, M, Piedra, N, Romero, A, Sarango-Lapo, C, Schuwer, R, Thomson, S, Torres, D, Villar-Onrubia, D