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My bibliography link which is necessary for LaTeX export how Tyler mentioned:

My bibliography link which is necessary for LaTeX export how Tyler mentioned. Perhaps the problem can be found here.

My bibliography link which is necessary for LaTeX export how Tyler mentioned:

* Bibliographie
<<bibliography>>
[[bibliography:../../Documents/Bibliography/references.bib]]

An excerpt from my org mode file:

** Installed version
- emax64-26.3-20191225 cite:Freeman2015
- [[https://github.com/m-parashar/emax64][m-parashar / emax64]]

And the entry in the BibTeX File:

% Encoding: UTF-8
 
@Book{Freeman2015,
  author    = {Freeman, Eric},
  editor    = {Freeman, Eric [Verfasser/in] and Robson, Elisabeth [Verfasser/in] and Sierra, Kathy [Verfasser/in] and Bates, Bert and Schulten, Lars and Buchholz, Elke},
  publisher = {O'Reilly Verlag},
  title     = {Entwurfsmuster von Kopf bis Fuß},
  year      = {2015},
  address   = {[Erscheinungsort nicht ermittelbar]},
  isbn      = {9783955619879},
  note      = {1 Online-Ressource},
  file      = {:Freeman2015_EntwurfsmusterVonKopfBisFuss.pdf:PDF},
  groups    = {Erzeugungsmuster},
  keywords  = {Entwurfsmuster. Java 8. Software-Design},
  language  = {Deutsch},
  url       = {http://www.content-select.com/index.php?id=bib_view&ean=9783955619879},
}
 
@Comment{jabref-meta: databaseType:bibtex;}
 
@Comment{jabref-meta: grouping:
0 AllEntriesGroup:;
1 StaticGroup:Erzeugungsmuster\;0\;1\;0x8a8a8aff\;\;\;;
}

Thanks to NickD for his hint.