JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 35, page. S534 - S536, 1999-07
SURFACE SCIENCE, vol. 430, no. 1-3, page. L515 - L520, 1999-06-21
PHYSICAL REVIEW LETTERS, vol. 82, no. 20, page. 4066 - 4069, 1999-05-17
SOLID STATE COMMUNICATIONS, vol. 113, no. 2, page. 83 - 87, 1999-01
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, vol. 68, no. 1, page. 115 - 118, 1999-01