provide ref to source properties methods paper

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/usr/local/lib/python3.8/site-packages/sphinx_tabs/tabs.py:341: RemovedInSphinx40Warning: The app.add_javascript() is deprecated. Please use app.add_js_file() instead.
app.add_javascript(path)
/usr/local/lib/python3.8/site-packages/healpy/fitsfunc.py:351: UserWarning: If you are not specifying the input dtype and using the default np.float64 dtype of read_map(), please consider that it will change in a future version to None as to keep the same dtype of the input file: please explicitly set the dtype if it is important to you.
warnings.warn(
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