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I'm getting the following error message from bibtex.
$ bibtex test.tex
I couldn't open file name `test.tex.aux'
What is causing this? [NB. I'm about to write an answer to this question.]
You need to leave out the ".tex" in the invocation of bibtex. I.e. you need to run bibtex test rather than bibtex test.tex.
Required, but never shown