[Tex/LaTex] Referencing items while using uncover

Question

I am writing a presentation (using beamer) for a seminar and I just faced a problem I can't handle.

On one slide, I have a big equation and then use an uncover-list to explain all the elements in detail. Later on, I want to have a reference to one particular explanation so that I can click it and go back to the equation, with the explanation highlighted.

However, the reference points to the beginning of the slide (i.e. equation shown, items semi-transparent). But I want to go to the specific slide – the one with a specific item of the itemize highlighted.

Below is a minimal example of the problem I have encountered. How do I cope with it?

\begin{frame}
  % big nasty equation here
  \begin{itemize}
    % explanations for parts of the equation here
    \setbeamercovered{transparent}
    \uncover<2>{
      \item first item
    }
    \uncover<3>{
      \item second item
    }
    \uncover<4>{
      \item third item
    }
    \uncover<5>{
      \item \label{special_item} fourth item
    }
  \end{itemize}
\end{frame}
% skipping some frames here
\begin{frame}
  \ref{special_item}
\end{frame}

Answer 1

This is described in Section 11 of the beamer user guide:

\documentclass{beamer}

\begin{document}
\begin{frame}
  % big nasty equation here
  \begin{itemize}
    % explanations for parts of the equation here
    \setbeamercovered{transparent}
    \uncover<2>{
      \item first item
    }
    \uncover<3>{
      \item second item
    }
    \uncover<4>{
      \item third item
    }
    \uncover<5>{
        \hypertarget<5>{special_item}{}
      \item fourth item
    }
  \end{itemize}

\end{frame}
% skipping some frames here
\begin{frame}
  \hyperlink{special_item}{Link}
  \ref{special_item}
\end{frame}
\end{document}