Allow multiple files in bibtex_bibfiles

[acocac]

Hi,

I'm trying to have separate bib files (references.bib and readings.bib) for certain sections. When I declare both files in bibtex_bibfiles in config.yml, it only recognises the first one as the build command returns the following warning:

WARNING: _bibliography/readings.bib not found or not configured in bibtex_bibfiles

According to the Sphinx documentation, there is an advanced feature to split bibliographies per BIB file. I wonder if someone knows if there is a workaround to use this feature in`jupyter-book'.

Here is my jupyter-book --version:
jupyter-book --version:
Jupyter Book : 0.11.1
External ToC : 0.2.2
MyST-Parser : 0.13.7
MyST-NB : 0.12.3
Sphinx Book Theme : 0.1.0
Jupyter-Cache : 0.4.2
NbClient : 0.5.3