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Proceedings of SICE Annual Conference 2010 > 2570 - 2575
IEEE Transactions on Circuits and Systems I: Regular Papers > 2010 > 57 > 1 > 213 - 224
IEEE Transactions on Automatic Control > 2009 > 54 > 6 > 1330 - 1335
IEEE Transactions on Automatic Control > 2008 > 53 > 1 > 389 - 393