klassendiagramm und wording digitization

dexes/literature.bib

@@ -351,3 +351,11 @@
   year         = {2023},
   note         = {Zugriff: Februar 2023}
 }
+
+@misc{bib:typo3-docs-sys-category,
+  author       = {{TYPO3 Contributors}},
+  howpublished = "\url{https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Categories/Index.html}",
+  title        = {{System categories}},
+  year         = {2023},
+  note         = {Zugriff: März 2023}
+}