1. T.Goto and T.Sugishita (1991) Jpn.J.Appl.Phys. 30: L997.
2. T.Goto (1994) Physica B 194–196: 2041.
3. T.Goto (to be published) in Proceed.of M2HTSC-IV, Grenoble July 5–9, 1994.
4. T.Goto, T.Sugishita, and K.Kojima (1990) Physica C 171: 441.
5. T.Goto (to be published) in Proceed. of 8th CIMTEC, Florence July 1–4, 1994.