Install cb2bib by entering the following commands in the terminal:
sudo apt update sudo apt install cb2bib
extract bibliographic references from various sources
cb2bib is a program to extract bibliographic references from unformatted and non standard sources, like: - email alerts; - journal Web pages; - and most interestingly PDF files. . Output references are written to BibTeX-formatted files. Other features include: - article files can be linked and renamed by dragging them onto the cb2Bib window; - editing and browsing BibTeX files; - citing references, searching references and the full contents of the referenced documents; - inserting bibliographic metadata to documents; - writing short notes that interrelate several references.