1. V. E. Keilin, E. J. Klimenko, I. A. Kovalev, and B. N. Samoilove, Cryogenics
10: 224 (1970).
2. Y. Mori and N. Inai, in: Proceedings of 5th Intern. Cryogenic Engineering Conference, IPC Science and Technology Publications, Guildford, England (1974), p. 429.
3. L. Dresner, IEEE Trans. Magnetics
MAG-13(1): 670 (1977).
4. M. O. Hoenig, Y. Iwasa, D. B. Montgomery, and A. Bejan, in: Proceedings of 6th Symposium on Engineering Problems of Fusion Research, IEEE, New York (1975), p. 586.
5. D. B. Thomas, in: Proceedings of Meeting on Technology Arriving from High Energy Physics, CERN 74-9, European Organization for Nuclear Research, Geneva, Switzerland (1974); also H. Brechna, Superconducting Magnet Systems, Springer-Verlag, New York (1973), p. 23.