41
Published 2008
IEEE

42
Published 2009
IEEE

43
Published 2008
IEEE

44
Published 2010
IEEE

45
Published 1988
IET

46
Published 1979
IEEE

47
Published 2010
IEEE

48
Published 2011
IEEE

49
Published 1982
IEEE

50
Published 1983
IEEE

51
Published 1984
IEEE

52
Published 1985
IEEE

53
Published 1986
IEEE

54
Published 1988
IEEE

55
Published 1989
IEEE

56
Published 1990
IEEE

57
Published 1991
IEEE

58
Published 1992
IEEE

59
Published 2010
IEEE

60
Published 2008
IEEE