Read and write 'Bibtex' files. Convert between bibliography formats,
including 'Bibtex', 'Biblatex', 'PubMed', 'Endnote', and 'Bibentry'.
Includes a port of the 'bibutils' utilities by Chris Putnam
<https://sourceforge.net/projects/bibutils/>. Supports all
bibliography formats and character encodings implemented in
'bibutils'.