NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol. 417, no. 2-3, page. 450 - 456, 1998-11-11
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, vol. 37, no. 6A, page. 3626 - 3632, 1998-06
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 32, no. 5, page. L635 - L638, 1998-05
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol. 402, no. 1, page. 14 - 20, 1998-01-01