@book{32657,
	author = {Cull, Paul. and Flahive, Mary. and SpringerLink (Online service)},
	title = {Difference Equations},
	publisher = {Springer New York,},
	year = {2005.},
	series = {Undergraduate Texts in Mathematics,},
	address = {New York, NY :},
	url = {http://dx.doi.org/10.1007/0-387-27645-9}
}