1. G. L. Al’tman, Microwave Devices (Mir, Moscow, 1968) [Russian translation, ed. by I. V. Lebedev].
2. B. A. Abubakirov, K. G. Gudkov, and E. V. Nechaev, Measurements of Parameters of Radio Circuits (Radio i Svyaz’, Moscow, 1984) [in Russian, ed. by V. G. Andrushchenko and B. P. Fateeva].
3. M. T. Bova, V. O. Goizhevskii, S. M. Maevskyi, and V. V. Molebnyi, Measurements of Phase Difference in Radio Electronics (Vissh. Shkola, Kiev, 1972) [in Ukrainian].
4. A. M. Chernushenko and A. V. Maiborodin, Measurements of Parameters of Electronic Devices Operating in the Decimeter and Centimeter Wavelength Bands (Radio i Svyaz’, Moscow, 1986) [in Russian, ed. by A. M. Chernushenko].
5. V. B. Pestryakov, Phase Radio Technical Systems (Sov. Radio, Moscow, 1968) [in Russian].