Hervás-Gómez, C., Román Graván, P. ., Domínguez-González, M. Ángeles ., & 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, (15), 35-56. https://doi.org/10.46661/ijeri.4970