@book{22600,
	author = {Penrose, Roger.},
	title = {Shadows of the mind : A Search for the missing science of consciousness},
	publisher = {Oxford University Press,},
	year = {1994.},
	address = {Oxford ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0637/94012887-d.html}
}