1. Akira Ohite and Hideto Iwaoka, IEEE Trans. Instrum. Meas.,25, No. 4 (1976).
2. J. Rutkowski, Integrated Operational Amplifiers [Russian translation], Mir, Moscow (1978).
3. B. Ya. Blagitko and A. M. Leonovenko, Tr. Permsk. Gosuniv. im. Gor'kogo,12, No. 4 (1971).
4. A. M. Lenovenko, Radiospektroskopiya, No. 13 (1979).
5. A. M. Lenovenko and E. N. Fedorchuk, Radiospektroskopiya, No. 10 (1976).