21
Published 1996
IET

24
Published 2010
IEEE

25
Published 2010
IEEE

26
Published 2010
IEEE

27
Published 1968
IEEE

28
Published 1969
IEEE

29
Published 1970
IEEE

30
Published 1971
IEEE

31
Published 1972
IEEE

32
Published 1974
IEEE

33
Published 1981
IEEE

34
Published 1982
IEEE

35
Published 1983
IEEE

36
Published 1984
IEEE

37
Published 1985
IEEE

38
Published 1986
IEEE

39
Published 1987
IEEE

40
Published 2006
IET