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IEEE TRANSACTIONS ON SIGNAL PROCESSING, vol. 49, no. 8, page. 1768 - 1785, 2001-08
IEICE TRANSACTIONS ON COMMUNICATIONS, vol. E84-B, no. 4, page. 1079 - 1086, 2001-04
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IEEE COMMUNICATIONS LETTERS, vol. 5, no. 2, page. 70 - 72, 2001-02