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IEEE Industry Applications Magazine > 2009 > 15 > 4 > 52 - 59
IEEE Spectrum > 2009 > 46 > 3 > 42 - 58
Proceedings of the IEEE > 2008 > 96 > 9 > 1457 - 1486
IEEE Spectrum > 1969 > 6 > 3 > 83 - 90
IRE Transactions on Military Electronics > 1960 > MIL-4 > 4 > 497 - 501