APPLIED PHYSICS LETTERS, vol. 75, no. 16, page. 2377 - 2379, 1999-10-18
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, vol. 38, page. 646 - 649, 1999-01
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, vol. 437, no. 2-3, page. 516 - 520, 1999-11-21
SURFACE SCIENCE, vol. 480, no. 3, page. 188 - 195, 2001-06-01