IEICE TRANSACTIONS ON COMMUNICATIONS, vol. E85B, no. 9, page. 1860 - 1862, 2002-09
IEICE TRANSACTIONS ON COMMUNICATIONS, vol. E85B, no. 6, page. 1213 - 1217, 2002-06
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, vol. E85D, no. 6, page. 1049 - 1051, 2002-06
LECTURE NOTES IN COMPUTER SCIENCE, vol. 2343, page. 81, 2002-01