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IEEE Signal Processing Letters > 2013 > 20 > 7 > 713 - 716
IEEE Transactions on Audio, Speech, and Language Processing > 2013 > 21 > 7 > 1434 - 1444
IEEE Transactions on Information Theory > 2013 > 59 > 1 > 672 - 679
IEEE Transactions on Education > 2013 > 56 > 2 > 183 - 190