@book{71581,
	author = {Ziemer, Rodger E. and Tranter, William H.},
	title = {Principles of communication : systems, modulation, and noise },
	publisher = {Wiley},
	year = {c.2015},
	address = {USA},
	edition = {Seventh edition.},
	url = {http://www.amazon.com/Principles-Communications-Rodger-E-Ziemer/dp/1118078918/ref=sr_1_1?s=books&ie=UTF8&qid=1456217542&sr=1-1&keywords=9781118078914}
}