Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) OVERALL CM,Evidence for polymorphonuclear leukocyte collagenase and 92-kilodalton gelatinase in gingival crevicular fluid,Infect Immun,,,1991,59,,4687-4692,https://cir.nii.ac.jp/crid/1570291225016321408,