21
Published 2000
American Chemical Society

22
Published 2002
American Chemical Society

23
Published 2002
American Chemical Society

24
Published 1990
American Chemical Society

25
Published 1996
American Chemical Society

26
Published 1989
American Chemical Society

27
Published 1999
American Chemical Society

28
Published 1989
American Chemical Society

29
Published 1990
American Chemical Society

30
Published 1993
American Chemical Society

31
Published 2003
American Chemical Society

32
Published 1990
American Chemical Society