# Switching between numeric and authoryear in Natbib

I need to switch between numeric and authoryear style in Natbib, in the same document. Particularly, I want it to be numeric the first time a citation is used and authoryear any subsequent times. Does anyone know how to do this?

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Particularly I find this somehow awkward since it will disrupt the consistency of the citations. That being said, one option would be to use the numbers package option for natbib and to use \cite the first time that a bibliographical reference will be cited and then a combination of \citeauthor and \citeyear for the subsequent citations of the same bibliographical item; something along these lines:

\documentclass{article}
\usepackage[numbers]{natbib}

\newcommand\Mycite[1]{%
\citeauthor{#1}~[\citeyear{#1}]}

\begin{document}

First citation: \cite{goossens93}
Second citation: \Mycite{goossens93}

\bibliographystyle{plainnat}
\bibliography{biblio}

\end{document}


with biblio.bib:

@book{goossens93,
author = "Michel Goossens and Frank Mittlebach and Alexander Samarin",
title = "The Latex Companion A",
year = "1993",