I have nearly every paper I’ve ever read stored in a BibTeX database, so I wrote a BASH script to build a list of citations using BibTeX that could be easily copied into LibreOffice Writer. I would prefer to write all my papers in LaTeX, but there are some disadvantages–poor adoption and inefficient track-changes methods–so I have to use LibreOffice Writer instead. None of the available bibliography managers that integrate with LibreOffice seem particularly reliable to me, and I plan to convert my manuscripts back to LaTeX anyway when I put my thesis together.
My reference keys in BibTeX all follow a similar pattern, starting with a hash (#), then a capital letter, followed by up to 3 lower-case letters, then two numbers for the year, and possibly another lower-case letter if the same author wrote two papers in the same year. If you speak regex, it looks like this :
To cite a paper written by Dr. Blaggs et al. in 1978, I would write #Bla78 in text where I wanted the citation to appear. The script then pulls the citations out of the .docx file in order, creates a list of citations, and replaces the in-text key with a number (in the current version, though it could be adapted for bracket citations).
If this sounds useful to you, you can grab the script here.
Also, the regex for an in-text cite of the format Blaags 2008, or Blaags and Quargs 2010, or Blaags et al. 2013, is