1. Itoh, D., Shimizu, E., Fujioka, T., Ogiwara, H., Akita, S., Ishikawa, T. and Tanaka, T. to be presented in this conference.
2. Preliminary tests on a superconducting power transformer
3. Application of Superconducting Technology to Power Transformers
4. Fevrier, A. and Laumand, Y. Proc. of 11-th Int. Cryog. Eng. Conf., Berlin-West (1986) pp.139–152.