1. A Metal-Semiconductor Capacitor
2. Zelikman , A. N. , Krein , O. E. , Samsonov , G. V. ( 1966 ). ‘Metallurgy of rare metals’ Jerusalem, Israel Program for Scientific Translations , p. 136 .
3. Miller , G. L. ( 1959 ).Tantalum and Niobium, London , Butterworth , p. 5 .