1
by Meeus, J.
Published 1991
WRR

2
by Louwes, S.L.
Published 1986
WRR

3
by Feenstra, J.J.
Published 1988
WRR

4
by van der Wal, H.
Published 1985
WRR

5
by van Stipriaan, A.
Published 1993
Brill

6
by van Stipriaan, Alex
Published 1993
Brill