1
by Freedman
Published 1991
2
by Ziegler
Published 1993
3
by Buszynski
Published 1992
4
5
by Daniels
Published 1993
6
Published 1990
7
by Soros
Published 1991
8
Published 1989
9
by Winiecki
Published 1991
10
by Lane
Published 1992
11
Published 1988
12
by Simons
Published 1990
13
14