@book{26979,
	author = {Helfrick, Albert D. and Cooper, William David.},
	title = {Modern electronic instrumentation and measurement techniques /},
	publisher = {Prentice Hall },
	year = {c1990.},
	address = {Englewood Cliffs, N.J. },
	note = {Rev. ed. of : Electronic instrumentation and measurement techniques.}
}