What are FFP2 masks, mandatory in some European countries?
Face masks and respirators in the fight against the COVID-19 pandemic: An overview of the standards and testing methods - ScienceDirect
Coronavirus: Which Countries Have Mask Mandates and Do They Work?
COVID-19 pandemic in Germany - Wikipedia
Germany weighs up mandatory FFP2 masks in shops and on transport | Coronavirus | The Guardian
Coronavirus: Germans don compulsory masks as lockdown eases - BBC News
Face masks: what are the rules in EU countries? - CGTN
The face mask global value chain in the COVID-19 outbreak: Evidence and policy lessons
Germans face fines of up to $5,000 as wearing a face mask becomes mandatory | CNN
Mask wearing in community settings reduces SARS-CoV-2 transmission | PNAS
/cloudfront-us-east-2.images.arcpublishing.com/reuters/4BETIKDSHNOFJH4EE6SRKMIQ7I.jpg "Germany to drop COVID mask requirement on flights | Reuters")
Germany to drop COVID mask requirement on flights | Reuters
Stricter mask requirements in all regions of Germany from today | trans.info
Germany: Tempers Flare Over Mask Requirement - DER SPIEGEL
Updated Mask Requirements for Entering Germany
COVID masks will return in Germany, says justice minister – POLITICO
European countries mandate medical-grade masks over cloth face coverings | CNN
Germany to drop obligation to wear a mask on long-distance trains and buses | Euronews
What the science says about lifting mask mandates
FFP2 masks now required for shopping and public transit in Bavaria | Article | The United States Army
Germany tightens COVID rules for travel during fall, winter | AP News
German states strike mask requirements in public transportation - World Socialist Web Site
COVID-19 measures lifted in most European countries
