@article {Copeland:April 1998:0003-2638:128,
	author = "Copeland B.J.",
	title = "Turing's O-machines, Searle, Penrose and the brain",
	journal = "Analysis",
	volume = "58",
	year = "April 1998",
	abstract = "",
	pages = "128-138(11)",
	url = "http://www.ingentaconnect.com/content/bpl/anal/1998/00000058/00000258/art00113"
}