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Applied Physics Letters 81, 3654-3656 (2002)

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Journal of the Korean Physical Society 39, 421-424 (2001)

Applied Physics Letters 78, 805–807 (2001)

Applied Physics Letters 78, 805–807 (2001)

Materials Science and Engineering B 67, 23–30 (1999)

Physical Review Letters 83, 3486–3489 (1999)

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Applied Physics Letters 73, 2651-2653 (1998)

Applied Physics Letters 73, 1445–1447 (1998)

Physical Review Letters 81, 2926-2929 (1998)

Applied Physics Letters 72, 906–908 (1998)

Physical Review Letters 80, 1473–1476 (1998)

Applied Physics Letters 72, 2102–2104 (1998)

Physical Review Letters 81, 3479-3482 (1998)