GitHub - islandoftex/checkcites: checkcites is a Lua script written for the sole purpose of detecting undefined/unused references from LaTeX auxiliary or bibliography files.
LaTeX/Bibliography Management - Wikibooks, open books for an open world
Heartbreakingly Solved the Error “Citation Undefined in Latex” | by Qinjiang | Medium
LaTeX-Workshop warnings in citations that are present (using %!TEX root) · Issue #734 · James-Yu/LaTeX-Workshop · GitHub
biblatex - Warning Citation undefined even after defining citation in the .bib file - TeX - LaTeX Stack Exchange