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PHYSICAL REVIEW B, vol. 80, no. 18, page. 180403 - 180403, 2009-11
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 54, no. 2, page. 712 - 715, 2009-02
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PHYSICAL REVIEW B, vol. 79, no. 3, page. 35105, 2009-01
PHYSICAL REVIEW B, vol. 79, no. 3, 2009-01