JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, vol. 42, no. 11, page. 7091 - 7094, 2003-11
PHYSICS LETTERS A, vol. 316, no. 3-4, page. 233 - 237, 2003-09-22
PHYSICS LETTERS A, vol. 314, no. 5-6, page. 464 - 471, 2003-08-11
ANNALS OF NUCLEAR ENERGY, vol. 30, no. 11, page. 1123 - 1134, 2003-07