@article {Pithon:1 March 1999:0006-3657:112,
	author = "Pithon J.A.",
	author = "Dytham C.",
	title = "Census of the British Ring-necked Parakeet Psittacula krameri population by simultaneous counts of roosts",
	journal = "Bird Study",
	volume = "46",
	year = "1 March 1999",
	abstract = "",
	pages = "112-115(4)",
	url = "http://www.ingentaconnect.com/content/bto/bird/1999/00000046/00000001/461112"
}