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Bactericidal action of positive and negative ions in air.
Fletcher LA, Gaunt LF, Beggs CB, Shepherd SJ, Sleigh PA, Noakes CJ, Kerr KG. Fletcher LA, et al. BMC Microbiol. 2007 Apr 17;7:32. doi: 10.1186/1471-2180-7-32. BMC Microbiol. 2007. PMID: 17439657 Free PMC article.