ELECTRONICS LETTERS, vol. 38, no. 22, page. 1403 - 1405, 2002-10-24
APPLIED PHYSICS LETTERS, vol. 81, no. 17, page. 3257 - 3259, 2002-10-21
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 41, no. 1, page. 144 - 148, 2002-07
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, vol. 41, no. 4A, page. 1920 - 1923, 2002-04