@book{ BA31645059, author = "European Workshop on Periodontology and Lang, Niklaus Peter and Karring, Thorkild and Jan Lindhe", title = "Proceedings of the 2nd European workshop on periodontology : chemicals in periodontics/ edited by: Niklaus P. Lang, Thorkild Karring, Jan Lindhe.", publisher = "Quintessence", year = "1997", URL = "https://ci.nii.ac.jp/ncid/BA31645059" }