1
Article
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Article
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6
7
by Tschörtner, Heinz Dieter
Published 1986
Published 1986
Book
8
9
by Erdmann, Gustav
Published 2000
Published 2000
Book
10
11
12
13
by Tschörtner, Heinz Dieter
Published 1996
Published 1996
Book
14
15
by Tschörtner, Heinz Dieter
Published 1996
Published 1996
Book
16
17
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