We can go through the `.aux` file and find all references to bibitems. Then, report unused one. Similar to what they do: https://tex.stackexchange.com/questions/43276/unused-bibliography-entries-how-to-check-which-entries-were-not-used
We can go through the
.auxfile and find all references to bibitems. Then, report unused one. Similar to what they do: https://tex.stackexchange.com/questions/43276/unused-bibliography-entries-how-to-check-which-entries-were-not-used