1. H. Tsuruga and K. Endoh, in: Proceedings 5th Intern. Cryogenic Engineering Conference, IPC Science and Technology Press, Guildford, England (1974), p. 262.
2. M. D. Reeber, J. Appl. Phys.
34: 481 (1963).
3. A. P. Dorey, Cryogenics
5: 146 (1965).
4. D. N. Lyon, in: International Advances in Cryogenic Engineering, Plenum Press, New York (1965), p. 371.
5. J. J. Thibault, J. Roussel, and E. Faddi, in: Bull. Intern. Institute of Refrigeration, Annex 4, Pergamon Press, London (1965), p. 249.