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2008 Congress on Image and Signal Processing > 5 > 488 - 492
2008 Congress on Image and Signal Processing > 4 > 73 - 77
IEEE Sensors Journal > 2008 > 8 > 8 > 1437 - 1444
1993 IEEE International Conference on Acoustics, Speech, and Signal Processing > 1 > 285 - 288 vol.1