@book{51447,
	author = {Holmgren, Richard A.},
	title = {A first course in discrete dynamical systems /},
	publisher = {Springer,},
	year = {c1996},
	series = {Universitext},
	address = {New York :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0817/96014777-d.html}
}