1. Green, M. S., andA. V. Tobolsky, J. Chem. Phys.14, 80 (1946).
2. Lodge, A. S., Trans. Faraday Soc.52, 120 (1956).
3. Lodge, A. S., Rheology of Elastomers (London to appear in 1958).
4. Carslaw, H. S., andJ. C. Jaeger, Operational Methods in Mathematical Physics p. 285 (London 1948).
5. Copson, E. T., Functions of a Complex Variable, p. 79 (Oxford 1935).