1. F. T. Bacon, Col.: Fuel Cells, Editor Young [Russian translation], IL, Moscow (1963), p. 75.
2. R. Kh. Burshtein, A. G. Pshenichnikov, and N. A. Shumilova, Dokl. Akad. Nauk SSSR,143, 1409 (1962).
3. G. Feuillage, J. Chim. Phys. et Phys-chim. Biol., 60, 613 (1963).
4. F. P. Dousek, J. Jindra, and M. Svata, Collect. Czechosl. Chem. Communs.,29, 2232 (1964).
5. O. K. Davtyan, Col.: Fuel Cells. Some Theoretical Problems [in Russian], ?Nauka? Press, Moscow (1964), p. 49.