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Thank you very much. The natbib package worked well. In fact, I really got [Granger, 2003; Zhang, 1993] as I wanted.

My problem now is the style of the references. When I used the the bibstyle unsrtnat , I got:

Sébastien Granger. Une approche statistique multi-échelle au recalage rigide
de ...

Hi,

I am using Miktex 2.7. My gool is to use the authordate1 bibstyle. So,
I installed the package authordate1-4 and I wrote this code:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[a4paper,12pt,oneside]{book}
...
\usepackage{authordate1-4}

\begin{document}
...
...
\bibliographystyle ...