@book{92719,
	author = {Oppenheim, Alan V., and Schafer, Ronald W.,},
	title = {Discrete-time signal processing /},
	publisher = {Prentice Hall,},
	year = {1989},
	series = {Prentice-Hall signal processing series},
	address = {Englewood Cliffs, NJ :},
	edition = {International Edition}
}