1. Oesch, U., Anker, P., Ammann, D. and Simon, W. 1985.Ion-Selective Electrodes, 4, Edited by: Pungor, E. 81Budapest: Akadémiai Kiadó.
2. Kimura, K. and Shono, T. 1985.Ion-Selective Electrodes, 4, Edited by: Pungor, E. 155Budapest: Akadémiai Kiad[otilde].