1
by Prescott
Published 1996
2
by MCLEAN
Published 1985
3
by BENTLEY
Published 1995
4
by BENTLEY
Published 1988
5
6
by JALOTE
Published 1994
7
by KAI-Yeung
Published 1995
8
by HARVEY
Published 1994
9
by PRZYTULA
Published 1993
10
by TENENBAUM
Published 1990
11
by Beekman
Published 1997
12
Published 1995
13
Published 1996
14
Published 1996
15
Published 1996
16
Published 1991
17
by Clapham
Published 1996
18
by Madigan
Published 1997
19
by Grauer
Published 1998
20
by Hubbard
Published 1996