1. H. Preston-Thomas, Metrologia 27, 3 (1990). ibid, 107 (1990)
2. L. Rubin, Cryogenics 37, 341 (1997)
3. A.C. Anderson, in Temperature: Its Measurement and Control in Science and Industry, Part 2, ed. by H.H. Plumb (ISA, Pittsburgh, 1972), pp. 773–784
4. R.J. Balcombe, D.J. Emerson, R.J. Potton, J. Phys. E 3, 43 (1970)
5. G. Halverson, D.A. Johns, in Temperature: Its Measurement and Control in Science and Industry. Part 2, ed. by H.H. Plumb (ISA, Pittsburgh, 1972), pp. 803–814