2
4
published 1985
Book
7
published 1984
Book Conference Proceedings
9
by Dohlus, Horst
published 1983
Book
10
by Felfe, Werner
published 1983
Book
11
by Verner, Paul
published 1982
Book Conference Proceedings
15
published 1980
Book
16
17
Book
18
19
by Herrmann, Joachim, Honecker, Erich
published 1978
Book
20
by Honecker, Erich
published 1978
Book