1. Kahn, P. G. K. & Pompea, S. M. Nature 275, 606–611 (1978).
2. Rosenberg, G. D. & Runcorn, S. K. (eds) Growth Rhythms and the History of the Earth's Rotation 559 (Wiley, New York, 1975).
3. Runcorn, S. K. Nature 204, 823–825 (1964).
4. Jeffreys, H. The Earth (Cambridge University Press, 1952).
5. Lyttleton, R. A. The Moon 19, 101–104 (1978).