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When I try to insert references from a report.bib file, a question mark appears in the paper.

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Ingmar
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pan xia
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    Did you run the normal cycle latex > bibtex (or biber) > latex (twice)? – Bernard Dec 01 '20 at 22:43
  • Sorry, I am newer to LaTex. What is that? – pan xia Dec 01 '20 at 22:45
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    there will have been a message on the terminal at the end to run biber on your document and then run latex again (some editors do this for you running pdflatex and biber and pdflatex on a single command, some you need to do the steps yourself) – David Carlisle Dec 01 '20 at 22:54
  • Hard to say something without more details, but as has been mentioned above, this could be a symptom of not running BibTeX correctly (or of BibTeX aborting the run with an error). Have a look at https://tex.stackexchange.com/q/63852/35864. If that (i.e. running BibTeX correctly) doesn't work, you may want to share some more details about your document and in particular the citation and bibliography setup. This is best done in a so-called MWE, a short yet fully compilable example document that contains only the relevant code for your problem. – moewe Dec 02 '20 at 06:58

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