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Tomonao Miyadai
Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation
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Hisao Takata
Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation
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Y\={u}z\={o} Shichij\={o}
Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation
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Noboru Tsuya
Research Institute of Electrical Communication, Tohoku University