Conti, Andrea Alberto. “Protective Face Masks through Centuries, from XVII Century Plague Doctors to Current Health Care Professionals Managing the COVID-19 Pandemic”. Acta Biomedica Atenei Parmensis 91, no. 4 (July 16, 2020): e2020124. Accessed July 17, 2024. https://mattioli1885journals.com/index.php/actabiomedica/article/view/10231.