1. Debye, P. Polar Molecules (Dover, New York, 1945).
2. Daniel, V. Dielectric Relaxation (Academic, New York, 1967).
3. Williams, G., Watts, D. C., Dev, S. B. & North, A. M. Trans. Faraday Soc. 67, 1323 (1971).
4. Wagner, K. W. Elektrotech. Z. 36, 135 and 163 (1915).
5. Jonscher, A. K. Nature 267, 673 (1977).