[1] HIGH PERFORMANCE COMP GRP, MIHAMA KU, CHIBA 261, JAPAN
[2] FUJITSU LTD, COMPUTAT SCI RES LAB, OTA KU, TOKYO 144, JAPAN
[3] FUKUI UNIV, FAC ENGN, DEPT APPL PHYS, FUKUI 910, JAPAN
[4] HIROSHIMA UNIV, DEPT PHYS, HIGASHIHIROSHIMA 724, JAPAN
[5] YAMAGATA UNIV, FAC EDUC, YAMAGATA 990, JAPAN
[6] ETH ZURICH, SCSC, CH-8092 ZURICH, SWITZERLAND
[7] LEIDEN UNIV, INST LORENTZ, NL-2300 RA LEIDEN, NETHERLANDS
[8] FEST, D-69118 HEIDELBERG, GERMANY