1. Barker, G. C.: Advances in Polarography, Vol. I, p. 144, Edit. I. S. Longmuir. London: Pergamon Press 1960.
2. Barker, G. C.: Anal. Chim. Acta 18, 118 (1958); vgl. diese Z. 165, 442 (1959).
3. Barker, G. C.: Polarography 1964, Vol. I, p. 25, Edit. G. J. Hills. London: MacMillan 1966.
4. Barker, G. C.: Progress in Polarography, Vol. II, Kap. XIX, Edit. P. Zuman and I. M. Kolthoff. New York: Intersc. Publ. 1962.
5. Barker, G. C.: Trans. Sympos. Electrode Processes, Philadelphia 1959, Chapt. 18, Edit. E. Yeager. New York: J. Wiley 1961.