Hervás-Gómez, C., Román Graván, P. ., Domínguez-González, M. Ángeles . and Reina Parrado, M. (2020) “Design and 3d printing of face shields by university teachers to protect healthcare personnel against the Covid-19”, IJERI: International Journal of Educational Research and Innovation. Sevilla, España, (15), pp. 35-56. doi: 10.46661/ijeri.4970.