1. British Patent Nos 885,107 (April 3, 1958)
2. and British Patent Nos 925,080 (February 5, 1960);
3. Belgian Patent No. 710,551 (1967).
4. and Electrodes of Conductive Metal Oxides, ed. by Part A, p. 301. Elsevier, Amsterdam (1980).
5. and Electrodes of Conductive Metal Oxides, ed. by Part B, p. 521. Elsevier, Amsterdam (1981).