Hervás-Gómez C, Román Graván P, Domínguez-González M Ángeles, Reina Parrado M. Design and 3d printing of face shields by university teachers to protect healthcare personnel against the Covid-19. ijeri [Internet]. 2020 Jul. 29 [cited 2024 May 4];(15):35-56. Available from: https://upo.es/revistas/index.php/IJERI/article/view/4970