@book{71297,
	author = {PROAKIS JOHIN},
	title = {Fundamentals of communication systems},
	year = {c2013.},
	url = {http://www.amazon.com/Fundamentals-Communication-Systems/dp/B007YTKNUC/ref=sr_1_1?ie=UTF8&qid=1455091662&sr=8-1&keywords=9788131705735}
}