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  1. Bates, Regis J. [Author]; Gregory, Donald [Author]

    Voice and data communications handbook - [4. ed.]

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    New York, NY [u.a.]: McGraw-Hill, c2001

    Published in: Standards and protocols

  2. Beker, Henry J. [Author]; Piper, Frederick C. [Author]

    Secure speech communications

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    London: Academic Pr., 1985

    Published in: Microelectronics and signal processing