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Carlson, A. Bruce, Paul B. Crilly, and Janet C. Rutledge. Communication Systems: An Introduction to Signals and Noise in Electrical Communication. 4th ed. Boston: McGraw-Hill, 2002.

Carlson, A. Bruce, et al. Communication Systems: An Introduction to Signals and Noise in Electrical Communication. 4th ed. McGraw-Hill, 2002.