\documentclass[11pt,a4]{article}
\usepackage{epic,eepic}
\usepackage{ecltree}
\usepackage{times}
\usepackage{amssymb,amsfonts,amsxtra,eucal,multicol,indentfirst}
\usepackage[latin1]{inputenc}
\usepackage[francais]{babel}
\usepackage[dvips]{graphicx}
\pagestyle{empty}
\voffset -0.9in
\hoffset -1in
\begin{document}

\begin{figure}[h]
\begin{center}
\hspace*{0cm}
\begin{bundle}{$\frac{1}{1}$}
\chunk{
\begin{bundle}{$\frac{1}{2}$}
\chunk{
\begin{bundle}{$\frac{1}{3}$}
\chunk{
\begin{bundle}{$\frac{1}{4}$}
\chunk{$\frac{1}{5}$} \chunk{$\frac{2}{7}$}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{2}{5}$}
\chunk{$\frac{3}{8}$} \chunk{$\frac{3}{7}$}
\end{bundle}
}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{2}{3}$}
\chunk{
\begin{bundle}{$\frac{3}{5}$}
\chunk{$\frac{4}{7}$} \chunk{$\frac{5}{8}$}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{3}{4}$}
\chunk{$\frac{5}{7}$} \chunk{$\frac{4}{5}$}
\end{bundle}
}
\end{bundle}
}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{2}{1}$}
\chunk{
\begin{bundle}{$\frac{3}{2}$}
\chunk{
\begin{bundle}{$\frac{4}{3}$}
\chunk{$\frac{5}{4}$} \chunk{$\frac{7}{5}$}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{5}{3}$}
\chunk{$\frac{8}{5}$} \chunk{$\frac{7}{4}$}
\end{bundle}
}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{3}{1}$}
\chunk{
\begin{bundle}{$\frac{5}{2}$}
\chunk{$\frac{7}{3}$} \chunk{$\frac{8}{3}$}
\end{bundle}
}
\chunk{
\begin{bundle}{$\frac{4}{1}$}
\chunk{$\frac{7}{2}$} \chunk{$\frac{5}{1}$}
\end{bundle}
}
\end{bundle}
}
\end{bundle}
}
\end{bundle}
\caption{\label{SternBrocot}{\it Arbre de Stern-Brocot}}
\end{center}
\end{figure}

\end{document}
