1
Published 2000
2
Published 1981
3
Published 1988
4
Published 1990
5
Published 1995
6
by Craven, John P.
Published 1982
7
Published 1987
8
Published 1991
9
Published 1988
10
Published 1991
11
Published 1991
12
Published 1992
13
Published 1992
14
Published 2009
15
Published 1979
16
by Vallega, Adalberto
Published 2001
17
18
by Friedmann, Wolfgang
Published 1971
19
Published 1995
20