@article {obertson:October 2002:0906-6713:7,
	author = "obertson P.B.R.",
	author = "ouen T.A.D.e.",
	title = "Controversies in periodontology",
	journal = "Periodontology 2000",
	volume = "30",
	year = "October 2002",
	abstract = "",
	pages = "7-8(2)",
	url = "http://www.ingentaconnect.com/content/mksg/pe2/2002/00000030/00000001/art00001"
	doi = "doi:10.1034/j.1600-0757.2002.03001.x"
}