21
published 1991
Book
22
published 1990
Book Wörterbuch
23
published 1989
Serial
24
published 1987
Book
25
published 1987
Book
26
published 1979
Herrn von Leibniz' Rechnung mit Null und Eins, Inhaltsverzeichnis
Book
27
published 1978
Journal
28
published 1973
Book
29
published 1972
Book