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\begin{enumerate}
\item bla
\item blabla
\item Quando o material termoplástico resfria, este endurece, desenvolvendo aderência entre o aço e o concreto, agora comprimido. \cite{Leonhardt}
\end{enumerate}

Where that 3 at the end is obviously the backref to the citation. This is the index of the enumerate item (if I move the citation to the second item, it becomes a 2, for example).
How does one make the backref return the page number?