@book{7233,
	author = {Blake, Thomas M},
	title = {The practice of electrocardiography : a problem-solving guide to confident interpretation},
	publisher = {Humana Press},
	year = {1994},
	address = {Totowa, N.J. },
	edition = {5th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0825/93039587-d.html}
}