@article {Sheldon:August 1996:0169-5347:317,
	author = "Sheldon B.C.",
	author = "Verhulst S.",
	title = "Ecological immunology: costly parasite defences and trade-offs in evolutionary ecology",
	journal = "Trends in Ecology and Evolution",
	volume = "11",
	year = "August 1996",
	abstract = "",
	pages = "317-321(5)",
	url = "http://www.ingentaconnect.com/content/els/01695347/1996/00000011/00000008/art10039"
	doi = "doi:10.1016/0169-5347(96)10039-2"
}