1. D.I. Boos, US Patent 3,536,963 (1970), to Standard Oil Co.
2. B.E. Hart, R. M. Peekema, US Patent 3,652,902 (1972), to IBM.
3. V.P. Zykov, A.A. Panov, P.A. Prudnikov, M.I. Khlopin, A.D. Shlyapnikov, US Patent 3,675,087 (1972).
4. Principles and applications of electrochemical capacitors
5. T. Morimoto, K. Hiratsuka, Y. Sanada, H. Aruga, US Patent 4,725,927 (1988), to Asahi Glass Co. and Elna Co. Ltd.