KOREAN APPLIED PHYSICS, vol. 2, no. 1, page. 79 - 83, 1989-01
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol. 264, no. 2-3, page. 135 - 146, 1988-02-15
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol. 254, no. 3, page. 477 - 486, 1987-03-01