diff -rupN --no-dereference PDAL-2.5.2-src/doc/conf.py PDAL-2.5.2-src-new/doc/conf.py
--- PDAL-2.5.2-src/doc/conf.py	2023-02-28 15:37:57.000000000 +0100
+++ PDAL-2.5.2-src-new/doc/conf.py	2023-03-07 08:22:48.766607840 +0100
@@ -56,8 +56,9 @@ sys.path.insert(0, os.path.abspath('.'))
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = ['breathe', 'sphinx.ext.autodoc',
               'sphinx.ext.mathjax', 'sphinx.ext.intersphinx',
-              'sphinxcontrib.bibtex', 'embed','notfound.extension']
+              'sphinxcontrib.bibtex', 'embed']
 
+bibtex_bibfiles = ['bibliography.bib']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']