@book{123287,
	author = {Popper, Karl R.},
	title = {Objective knowledge :},
	publisher = {Clarendon Press ;},
	year = {1979.},
	address = {Oxford [Eng.] :},
	edition = {Rev. ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0603/79318586-d.html}
}