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I'm very new to Latex so any help is appreciated. I am having trouble with some of my references. when using the \cite{} function some references come up as expected (e.g [1]) but others show as the question mark ([?]).

I am using TeXstudio and referencing from a single .bib. I have checked the .bib file and the reference is definitely there, I have even copied and pasted the citation key to make sure it isn't a typo error, but still I get this error. Are there any steps I can take to try and solve this?

I have already tried resynching my Mendeley library, compiling the latex document, deleting the .bib file and making a new document but none of that has worked.

Thank you for any help

Nicolas Martignoni
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Will
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    Welcome. Could you please provide a small example document that has this problem. Then it is lot easier to help. Are yuo sure the citation key exists? And that you have run bibtex(?) and LaTeX enough times? – daleif Jan 13 '22 at 15:13
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    I have actually just found that it was a math package that was stopping this from working. I'm unsure why but the reference now shows after the package has been turned off. Thank you for your help anyway! – Will Jan 13 '22 at 15:16
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    latex doesn't read the bib file, so you need to re-run bibtex to re-generate the references and then run latex twice to resolve all references after you add any new \cite to the document. – David Carlisle Jan 13 '22 at 15:21
  • This may sound very silly but I'm not sure what bibtex is or how to run it? I generated the .bib file using Mendeley and set the file up to auto sync when I created it. – Will Jan 13 '22 at 15:35
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    You are just in luck because TeXStudio runs bibtex for you. It is the programme that converts the .bib data into something LaTeX can use. – daleif Jan 13 '22 at 15:36
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    Do you mind telling us which package was problematic here? – daleif Jan 13 '22 at 15:37
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    Ah okay, brilliant! And yes, the package was \usepackage{gensymb} which I was recommended for some math notation – Will Jan 13 '22 at 15:50
  • Well gensymb haven't been updated since 2003 so there might be a conflict or two with other packages you are using. – daleif Jan 13 '22 at 16:10
  • That makes sense, I'll have a look for an alternate package, thank you for the help! – Will Jan 13 '22 at 16:24

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