References
- Nakamura , T. , Nakao , Y. , Kamisawa , A. and Takasu , H. 1995 . ISSCC Digest of Technical Papers , : 68 – 69 .
- Ishiwara , H. , Shimamura , T. and Tokumitsu , E. 1997 . Jpn. J. Appl. Phys , 36 : 1655 – 1658 .
- Ishiwara , H. 2000 . Proc. 22nd ICME , : 423 – 427 .