Since BibTeX always produces an output file of the form 'filename.bbl', it is necessary-in order to use both directory and bibliography entries-, after generating the bbl file corresponding to the directory, to rename it with a new extension (for example dir), and to give this new extension as an optional argument to the \directory command. The normal procedure can then be followed during the rest of the bibliography processing. Remember that changing the directory (adding an entry or suppressing one) forces you to restart from the beginning.
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