Outward and inward protection efficiencies of different mask designs for different respiratory activities Koh, Xue Qi ; Sng, Anqi ; Chee, Jing Yee ; Sadovoy, Anton ; Luo, Ping ; Daniel, Dan Abstract Publication: Journal of Aerosol Science Pub Date: February 2022 DOI: 10.1016/j.jaerosci.2021.105905 Bibcode: 2022JAerS.16005905K