Xu W, Gu C, Wang Q, Lin Y, Zhang C, Borkow G. Reduction of SARS-CoV-2 Infectious Titers by Direct Contact with Cuprous-Oxide Impregnated Face Masks External Layers. rajar [Internet]. 2021 Aug. 9 [cited 2024 Jul. 22];7(8):2471-6. Available from: https://rajournals.in/index.php/rajar/article/view/716