Man pages matching name tex::encode::bibtex in section 3pm:

TeX::Encode::BibTeX.3pm.en	debian 10 / libtex-encode-perl
TeX::Encode::BibTeX.3pm.en	debian 11 / libtex-encode-perl
TeX::Encode::BibTeX.3pm.en	debian 12 / libtex-encode-perl