1. Lodge, A. S., Nature, 176, 838 (1955); Trans. Farad. Soc., 52, 120 (1956).
2. Mohr, O., Zivilingenieur, 113 (1882). See, Timoshenko, S., “Theory of Elasticity”, 15 (McGraw-Hill, 1934).
3. Roberts, J. E., Proc. 2nd Int. Cong. Rheology, 91 (1954).
4. Jobling, A., thesis, Cambridge (1955).
5. Kuhn and Grün, Kolloid Z., 101, 248 (1942).