\documentclass{article}
\usepackage{pdfpages}
%\VignetteIndexEntry{Fitting ETAS model}
%\VignetteKeywords{Earthquake, Declustering, ETAS, Seismicity}
%\VignettePackage{ETAS}

\begin{document}
\includepdf[pages=-, fitpaper=true]{UsingETAS.pdf}
\end{document}