Received 30 Jun 2008, Accepted 26 Nov 2008, Published online: 27 May 2009, https://doi.org/10.1080/0191951090274

https://www.youtube.com/watch?v=pYGIAShKrZ4 https://combatcovid-19.com/affordable-ozone-machine-for-disinfecting http://thetibetclan.com/view?f=7etaDbweuUQ&n=954399309&u=98&b=10385