• http://www.mywellnesstutor.com/my-wellness-blog/2014/11/8/top-10-benefits-of-ozone-therapy
• https://www.georgekramermd.com/prolozone/
• http://www.kwanyinhealingarts.com/articles/what-ozone-prolozone-therapy/
• http://www.faim.org/prolozone-for-pain-relief
• http://www.nwimed.com/prolozone/
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312702/