Latex Temporarily disable superscript in citation

The following example changes \setcitestyle locally and puts it in macro \citen. \setcitestyle of package natbib (2010/09/13 8.31b) contains a space right at the beginning of the macro definition by an uncommented end of line, the trick with \romannumeral removes this space.

\documentclass{article}
\usepackage[square]{natbib}
\setcitestyle{super}

\newcommand*{\citen}[1]{%
  \begingroup
    \romannumeral-`\x % remove space at the beginning of \setcitestyle
    \setcitestyle{numbers}%
    \cite{#1}%
  \endgroup   
}

\begin{document}
Package \textsf{accsupp}\cite{oberdiek:accsupp}.
This figure is reproduce from reference~\citen{oberdiek:zref}.
\bibliographystyle{plainnat}
\raggedright
\bibliography{oberdiek-bundle}
\end{document}

Inside moving arguments (e.g., \caption) macro \citen can be protected using \protect or by using \DeclareRobustCommand for the definition:

\newcommand*{\citen}{}% generate error, if `\citen` is already in use
\DeclareRobustCommand*{\citen}[1]{%
  \begingroup
    \romannumeral-`\x % remove space at the beginning of \setcitestyle
    \setcitestyle{numbers}%
    \cite{#1}%
  \endgroup
}

Source: http://tex.stackexchange.com/questions/94178/temporarily-disable-superscript-in-citation