\documentclass[a4paper, 12pt, draft]{book}
\usepackage[frenchb, english]{babel}
\usepackage{amsmath, amssymb, yhmacro, hybook1, xspace}
\usepackage[T3,T1]{fontenc}

\newcommand{\editorname}{\'Ed}
\newcommand{\andname}{et}
\begin{document}

\setlength{\tiers}{0.31\textwidth}
\setlength{\abovedisplayskip}{4pt plus 1pt minus 3pt}
\setlength{\belowdisplayskip}{4pt plus 1pt minus 3pt}
\setlength{\abovedisplayshortskip}{0pt plus 1pt}
\setlength{\belowdisplayshortskip}{2pt plus 1pt minus 1pt}
\setlength{\parskip}{3pt}

\nocite{*}

\selectlanguage{french}
\bibliographystyle{frplain}
\bibliography{cours2f}

\end{document}


