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\documentclass[a4paper,11pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{etoolbox}
\usepackage[left=25mm,right=20mm,top=20mm,bottom=20mm,ignoreheadfoot]{geometry}
\usepackage{csquotes}
\usepackage[backend=biber,style=authoryear-comp]{biblatex}
\ExecuteBibliographyOptions{sortcites,sorting=nyt,maxnames=3,minnames=3,backref,date=year}
\usepackage{hyperref}


\addbibresource{snom.bib}
\addbibresource{tori.bib}


%%-------------------------------
\author{Jean Hare}
\title{Test Biblatex}
\date{17 novembre 2017}
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\begin{document}
%----------------------------------
\chapter{premier chapitre}


Une citation \autocite{BetzigTrautman91}

\nocite{*}

\cleardoublepage

\printbibliography


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\end{document}
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