1. Frank, K., Becker, M. C.: Microelectrodes for recording and stimulation. In: Physical techniques in biological research, Vol. V. W. L. Nastuk, Ed. New York: Academic Press 1964
2. Graeme, J. G., Tobey, G. E., Huelsman, L. P.: Operational amplifiers. New York: McGraw-Hill 1971
3. Inoue, I., Ishima, Y., Horie, H., Takenaka, T.: 124 Properties of excitable membrane produced on the surface of protoplasmic drop in Nitella. Proc. Japan Acad.47, 549?553 (1971)
4. Jost, W.: Theoretische und experimentelle Untersuchungen eines Negativimpedanzkonverters. Arch. elektr. Übertragung20, 281?288 (1966)
5. Wolbarsht, M. L., McNichol, E. F., Jr., Wagner, H. G.: Glass insulated platinum microelectrode. Science132, 1309?1310 (1960)