@article {Loudon:1 February 2008:0960-1643:128,
	author = "Loudon, Irvine",
	title = "The principle of referral: the gatekeeping role of the GP",
	journal = "British Journal of General Practice",
	volume = "58",
	year = "1 February 2008",
	abstract = "",
	pages = "128-130(3)",
	url = "http://www.ingentaconnect.com/content/rcgp/bjgp/2008/00000058/00000547/art00021"
	doi = "doi:10.3399/bjgp08X277113"
}