@book{20513,
	author = {Perko, Lawrence},
	title = {Differential equations and dynamical systems},
	publisher = {Springer-Verlag},
	year = {2004},
	series = {Texts in Applied Mathematics },
	address = {Berlin},
	edition = {3rd},
	note = {"Purchased under NBHM grant for the year 2004-2005"}
}