21
by Gilpin, Robert
Published 1987
22
by Hudson, Michael, 1939-
Published 1972
23
by Pippenger, John E, 1933-
Published 1984
24
by Henning, Charles N.
Published 1958
25
Published 1997
26
27
by Monroe,Wilbur F.
Published 1973
28
by Gill, Stephen, 1950 -
Published 1988
29
by Fawcett, J. E. S, 1913-
Published 1977
30
by Stern, Robert M, 1927-
Published 1973
31
Published 2000
32
by Melvin, Michael
Published 1985
33
by Griffith-Jones, Stephany
Published 1984
34
Published 2001
35
by Soros, George
Published 1998
36
by Mann, Richard
Published 1998
37
by Gandolfo, Giancarlo
Published 2002
38
Published 1995
39
Published 1989
40
Published 1996