JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, vol. 46, no. 4A, page. 1751 - 1756, 2007-04
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 50, no. 5, page. 1443 - 1449, 2007-05
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS, vol. 11, no. 2, 2008-02