1. Ross RG, Johnson DL, Sugimura RS (1991) Proceedings of the 6th International Cryocooler Conference, DTRC91/002: 27
2. Moon FC, Weng KC, Chang PZ (1989) J. Appl. Phys. 66: 5643
3. Carlson L (1991) Superconductor Industry 4: 22
4. Castles S, Breon S, Viens M, Allen C, Patschke R, Steward K, Mosely H, Brasunas J, Hilliard L, Richards C, Flom Y (1988) Presented at the First World Congress on Superconductivity, Houston, Texas
5. Heinen VO, Bhasin KB, Long KJ (1990) Presented at Second World Congress on Superconductivity, Houston, Texas and NASA TM 103629