BB	1. Carlson, A. Bruce. Communication systems : an introduction to signals and noise in electrical communication / A. Bruce Carlson, Paul B. Crilly, Janet C. Rutledge . - 4th. ed., International ed. Boston [etc.] : McGraw-Hill, cop. 2002
BB	2. Sklar, Bernard. Digital communications : fundamentals and applications / Bernard Sklar . - 2nd ed., repr. with corr. Upper Saddle River, New Jersey : Prentice-Hall PTR, 200
BB	3. Proakis, John G.. Digital Communications / John G. Proakis . - 4th ed., International ed. Boston [etc.] : McGraw-Hill, 2001
BB	4. Proakis, John G.. Communication systems engineering / John G. Proakis, Masoud Salehi Englewood Cliffs, New Jersey : Prentice Hall, cop. 1994