"Ozonization." . . "Environmental Research Laboratory (Duluth, Minn.)" . . "Chlorination." . . "Water Purification Ozonization." . . . "Chemical/biological implications of using chlorine and ozone for disinfection"@en . "Chemical/biological implications of using chlorine and ozone for disinfection" . . . . . . . . . . . . . . . . . . . . "University of Minnesota. Department of Chemistry." . . . .