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IEEE Transactions on Sustainable Energy > 2010 > 1 > 2 > 99 - 106
IEEE Sensors Journal > 2008 > 8 > 7 > 1268 - 1272
IEEE Sensors Journal > 2008 > 8 > 7 > 1375 - 1380
IEEE Transactions on Automatic Control > 2007 > 52 > 11 > 2085 - 2102
IEEE Transactions on Automatic Control > 2007 > 52 > 10 > 1882 - 1891