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This report describes experiments conducted by CDC to assess two ways of improving the fit of medical procedure masks.
Universal Mask and Cloth Face Covering Precautions
A technical review of face mask wearing in preventing respiratory COVID-19 transmission - ScienceDirect
Outward and inward protections of different mask designs for different respiratory activities
PDF) Effectiveness of different types of Masks in Aerosol Dispersion in SARS–CoV-2 Infection
Federal Register :: COVID-19 Vaccination and Testing; Emergency
One Year with COVID: Lessons Learned
Performance Comparison of Single and Double Masks: Filtration Efficiencies, Breathing Resistance and CO2 Content
The path of humanity in the pandemic of COVID-19: the choice of the realistic, optimist or pessimist scenario
Epidemiologia, Free Full-Text