WARNING: could not find bibtex key

Describe the bug

I need to include references in my book. I get the error WARNING: could not find bibtex key "MYKEY" In the output html I get only square brackets []. The keys are present in my references.bib file.

Reproduce the bug

To reproduce the problem just build the notebooks.

jupyter-book build --all .

Citations should be present in the content of notebooks according to instructions: https://jupyterbook.org/content/citations.html

List your environment

My enviroment is:

Debian GNU/Linux 11 (bullseye) (5.8.0-0.bpo.2-amd64 kernel)

Python 3.10.2

Jupyter Book : 0.12.2 External ToC : 0.2.3 MyST-Parser : 0.15.2 MyST-NB : 0.13.1 Sphinx Book Theme : 0.1.10 Jupyter-Cache : 0.4.3 NbClient : 0.5.12

Packages in conda environment:

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tornado=6.1=py310h6acc77f_2 traitlets=5.1.1=pyhd8ed1ab_0 typing_extensions=4.1.1=pyha770c72_0 tzcode=2021e=h7f98852_0 tzdata=2021e=he74cb21_0 uc-micro-py=1.0.1=pyhd8ed1ab_0 unicodedata2=14.0.0=py310h6acc77f_0 urllib3=1.26.8=pyhd8ed1ab_1 wcwidth=0.2.5=pyh9f0ad1d_2 webencodings=0.5.1=py_1 websocket-client=1.3.1=pyhd8ed1ab_0 wheel=0.37.1=pyhd8ed1ab_0 widgetsnbextension=3.5.2=py310hff52083_1 xerces-c=3.2.3=h8ce2273_4 xorg-kbproto=1.0.7=h7f98852_1002 xorg-libice=1.0.10=h7f98852_0 xorg-libsm=1.2.3=hd9c2040_1000 xorg-libx11=1.7.2=h7f98852_0 xorg-libxau=1.0.9=h7f98852_0 xorg-libxdmcp=1.1.3=h7f98852_0 xorg-libxext=1.3.4=h7f98852_1 xorg-libxrender=0.9.10=h7f98852_1003 xorg-libxt=1.2.1=h7f98852_2 xorg-renderproto=0.11.1=h7f98852_1002 xorg-xextproto=7.3.0=h7f98852_1002 xorg-xproto=7.0.31=h7f98852_1007 xz=5.2.5=h516909a_1 yaml=0.2.5=h7f98852_2 zeromq=4.3.4=h9c3ff4c_1 zipp=3.7.0=pyhd8ed1ab_1 zlib=1.2.11=h36c2ea0_1013 zstd=1.5.2=ha95c52a_0

[juhuebner]

You have to have this or similar somewhere (worked for me also with v0.12.2 and its actual dependencies)

```{bibliography}
```

That’s kind-of not clear in the docs, or possibly there is a default way missing (?)

[kokkytos]

You have to have this or similar somewhere (worked for me also with v0.12.2 and its actual dependencies)

```{bibliography}

That's kind-of not clear in the docs, or possibly there is a default way missing (?)

This solved the issue