https://github.com/jgm/pandoc-citeproc/blob/master/man/pandoc-citeproc.1.md より：
Format File extension ------------ -------------- BibLaTeX .bib BibTeX .bibtex Copac .copac CSL JSON .json CSL YAML .yaml EndNote .enl EndNote XML .xml ISI .wos MEDLINE .medline MODS .mods NBIB .nbib RIS .ris Note that `.bib` can generally be used with both BibTeX and BibLaTeX files, but you can use `.bibtex` to force BibTeX.
