21
Published 1989
IEEE

22
Published 1991
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24
Published 1993
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26
Published 1996
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29
Published 2010
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30
Published 2011
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31
Published 2010
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32
Published 2010
IET

33
Published 2008
IET

34
Published 2009
IET

35
Published 2010
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36
Published 2003
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37
Published 2004
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38
Published 2005
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39
Published 2006
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40
Published 2007
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