\begin{frame}[allowframebreaks,noframenumbering] % \frametitle{منابع} %\printbibliography \begin{latin} \bibliographystyle{IEEEtr} % ieeetr-plain=unsrt \scriptsize \setLTRbibitems \bibliography{REF} \nocite{*} % to add all reference in bib \end{latin} \end{frame}