@book{8635,
	author = {Oppenheim, Alan V., and Willsky, Alan S.},
	title = {Signals & systems /},
	publisher = {Prentice Hall,},
	year = {c1997.[reprinted 2005]},
	series = {Prentice-Hall signal processing series},
	address = {Upper Saddle River, N.J. :},
	edition = {2nd ed.}
}