1. Carslaw, H. S. and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. Oxford, 1959, p. 38.
2. loc. cit. Carslaw, H. S. and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. Oxford, 1959, p. 42.
3. Paterson, S., Phil. Mag.32 (1941) 384.
4. —loc. cit. p. 266.