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JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, vol. 31, no. 2A, page. L66 - L67, 1992-02-01

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, vol. 34, no. 10B, page. L1329 - L1331, 1995-10-15

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, vol. 35, no. 5A, page. L538 - L540, 1996-05-01

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, vol. 37, no. 1AB, page. L77 - L80, 1998-01-15