# References showing question marks [closed]

In LyX, I'm using the reference style apsrev.bst, which I downloaded from here:

http://www.maik.ru/pub/tex/revtex4/

This reference style is the one used in Physical Review.

But now when I add references, they show up as question marks in brackets (?).

Why does this happen? how can I fix it?

Thank you for any efforts

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## closed as too localized by egreg, Paulo Cereda, Joseph Wright♦Jul 3 '12 at 17:24

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Have you compiled your document more than once? –  Count Zero Jun 2 '12 at 11:47
@CountZero LyX should take care of all the necessary runs automatically. –  Torbjørn T. Jun 2 '12 at 12:06
Yes, I compile it all the time... but I think Torbjorn has a point. –  Samer Afach Jun 2 '12 at 12:20
I think we need some more information to find the cause of the problem, it works for me. To add the bibliography I used Insert --> List/TOC --> BibTeX bibliography. The `apsrev` style is part of TeX Liveit seems, as I could choose it in the bibliography window without downloading. I then used one of the `.bib` files already listed in LyX (`xampl.bib`) and added a couple citations (Insert --> Citation) from it to the document. After compiling with Ctrl + R everything shows up fine. –  Torbjørn T. Jun 2 '12 at 13:12
That's weird... could you please try it with document class "report"? –  Samer Afach Jun 2 '12 at 15:34