61
Published 2002
IEEE

62
Published 2004
IEEE

63
Published 2006
IEEE

64
Published 2008
IEEE

65
Published 2007
IEEE

66
Published 2008
IEEE

67
Published 2008
IEEE

68
Published 2004
IEEE

69
Published 2008
IEEE

70
Published 1990
IET

71
Published 2007
IET

72
Published 1992
IET

73
Published 1989
IET

74
Published 1989
IET

75
Published 2008
IET

76
Published 1989
IET

77
Published 1989
IET

78
Published 1993
IET

79
Published 2006
IEEE

80
Published 2007
IEEE