- para partículas" (PDF) (in
Brazilian Portuguese). "Standard for Dust Mask".
JICOSH Home.
Archived from the
original on 2020-05-25.
Retrieved 2020-04-30....
- ISSN 2045-2322. PMC 5209731. PMID 28051158. "Standard for Dust Mask".
JICOSH Home. Xie, John (2020-03-19). "World
Depends on
China for Face
Masks But...