Violante, Tommaso, and Francesco Saverio Violante. “Surgical Masks Vs Respirators for the Protection Against Coronavirus Infection: State of the Art”. La Medicina Del Lavoro | Work, Environment and Health, vol. 111, no. 5, Oct. 2020, pp. 365-71, https://doi.org/10.23749/mdl.v111i5.9692.