1. Davies, D. K., Static Electrification, Conf. Ser., 9 (1967) the Institute of Physics, London 1967).
2. Bässler, H., Kunststoffe 62, 115 (1972).
3. Fuhrmann, J., Colloid & Polymer Sci. 254, 129 (1976).
4. Bauser, H., Kunststoffe 62, 192 (1972).
5. Johnsen, U., G. Weber, Colloid & Polymer Sci. 252, 836 (1974).