Assume I have a .bbl file like this:
\begin{thebibliography}{}
\bibitem[\protect\astroncite{Abramowitz \& Stegun}{1965}]{Abrasteg65}
Abramowitz, M. \& Stegun, I.~A. (1965).
\newblock {\em Handbook of Mathematical Functions}.
\newblock Dover, New York.
...
\end{thebibliography}
Is there any efficient way of importing their entries to BibTeX?
