JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 51, no. 3, page. 912 - 915, 2007-09
SURFACE REVIEW AND LETTERS, vol. 9, no. 1, page. 285 - 291, 2002-02
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, vol. 18, no. 6, page. 2722 - 2727, 2000-11