1
Published 1983
2
by Langford
Published 1973
3
Published 1972
4
5
6
by Conrad
Published 1981
7
by Cox
Published 1973
8
by Jacobson
Published 1972
9
by Jacobson
Published 1975
10
11
Published 1988
12
13
by Lam Seng Fatt
Published 1996
14
Published 1958
15
16
by Spitzing
Published 1973
17
by Coote
Published 1988
18
19
by White
Published 1990
20
by Stroebel
Published 2013