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JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, vol. 34, no. 10B, page. L1329 - L1331, 1995-10-15
IEEE ELECTRON DEVICE LETTERS, vol. 16, no. 3, page. 109 - 111, 1995-03
IEEE ELECTRON DEVICE LETTERS, vol. 15, no. 7, page. 251 - 253, 1994-07