1. K. S. Cole and R. H. Cole, J. Chem. Phys., 9, 341 (1941).
2. J. E. B. Randies, Disc. Faraday Soc., 1 (1947).
3. M. Sluyters-Rehbach and J. Sluyters, Rec. Trav. Chim., P.B., 83, 217, 581, (1964).
4. M. Sluyters-Rehbach and J. Sluyters, Rec. Trav. Chim., P.B., 83, 967 (1964).
5. For discussion of Kramers-Kronig relations, see, e.g., J. M. Ziman, Principles of the Theory of Solids, p. 222, Cambridge Univ. Press (1964),