1. 13th Int. Conf. on Magnetically Levitated Systems and Linear Drive;Nakashima,1993
2. Int. Conf. on Speed up Technology for Railway and Maglev Vehicles;Suzuki,1993
3. Proc. 49th Meeting on Cryogenics and Superconductivity;Jizo,1993
4. Proc. 49th Meeting on Cryogenics and Superconductivity;Yamaguchi,1993