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In most BibTeX entries I found on the internet a page range in the page field is separated by a double hyphen --. Why should I use a double dash and not a single one -?

pages="1--99" <---

and not

pages="1-99" <---
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The correct symbol for a range of numbers is an en-dash, which in LaTeX is usually input as --. Many BibTeX style files (.bst) files will do a search and replace, so that - is replaced by -- in the output (.bbl file). However, you can't be 100% sure that any given style will do this. So by putting -- in the .bib file, you make sure that you get the correct output whatever the style does.

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