TY  - RPRT
TI  - Experimental human gingivitis.
AU  - L A Friedman
AU  - J M Klinkhamer
PY  - 1971
DO  - 10.1902/jop.1971.42.11.702
UR  - https://pubmed.ncbi.nlm.nih.gov/4942412/
ID  - 4942412
ER  -