Bibliography occurs twice in pdf output

Wolfgang Engelmann engelmann at
Mon Apr 12 08:24:09 UTC 2021

I have a normal Bibliography setting in my Koma script book which is 
correctly shown as such in the pdf output.

I have additionally a
Recommended literature
in the book with a few references
which refers to Section 4 of my Appendix as
Recommended literature.

Strangely, this
Recommended literature

is listed in the pdf file also as
so that I have
listed twice

Strange! What am I doing wrong?


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