21
Published 1990
American Chemical Society

22
Published 1990
American Chemical Society

23
Published 1990
American Chemical Society

24
Published 1991
American Chemical Society

25
Published 1991
American Chemical Society

26
Published 1991
American Chemical Society

27
Published 1992
American Chemical Society

28
Published 1992
American Chemical Society

29
Published 1993
American Chemical Society

31
Published 1995
American Chemical Society

32
Published 1995
American Chemical Society

33
Published 1996
American Chemical Society

34
Published 1996
American Chemical Society

35
Published 1997
American Chemical Society

36
Published 1997
American Chemical Society

37
Published 1997
American Chemical Society

38
Published 1997
American Chemical Society

39
Published 1999
American Chemical Society

40
Published 2000
American Chemical Society