JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 53, no. 2, page. 986 - 989, 2008-08
SURFACE SCIENCE, vol. 602, no. 7, page. 1408 - 1412, 2008-04-01
PHYSICAL REVIEW B, vol. 61, no. 12, page. 8250 - 8255, 2000-03-15
PHYSICAL REVIEW LETTERS, vol. 84, no. 8, page. 1724 - 1727, 2000-02-21
PHYSICAL REVIEW B, vol. 61, no. 3, page. 1688 - 1691, 2000-01-15
PHYSICAL REVIEW LETTERS, vol. 82, no. 5, page. 968 - 971, 1999-02-01
PHYSICAL REVIEW B, vol. 57, no. 3, page. 1352 - 1355, 1998-01-15
PHYSICAL REVIEW B, vol. 55, no. 23, page. 15464 - 15466, 1997-06-15
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 27, no. 1, page. 31 - 34, 1994-02
PHYSICAL REVIEW B, vol. 47, no. 21, page. 14020 - 14022, 1993-06-01