1. V. A. Anosov and S. A. Pogodin, Foundations of Physical-Chemical Analysis (Akad. Nauk SSSR, Leningrad, 1947), p. 311 [in Russian].
2. B. Mattias and W. Mezz, Helv. Phys. Acta 20, 273 (1947).
3. N. S. Kurnakov, A. Ya. Zvorykin, and V. Ya. Ketkovich, Izv. Sekt. Fiz.-Khim. Anal. 16(3), 108 (1948).
4. Y. Ono, T. Hikita, and T. Ikeda, J. Phys. Soc. Jpn. 56(2), 577 (1987).
5. A. I. Baranov, T. Schmidt, and L. A. Chuvalov, Ferroelectrics 100, 135 (1989).