-\chapterauthor{Imen Chakroun and Nouredine Melab}{University of Lille 1 CNRS/LIFL/INRIA, France}
+\chapterauthor{Imen Chakroun and Nouredine Melab}{University of Lille 1, CNRS/LIFL/INRIA, France}
%\chapterauthor{Nouredine Melab}{Universit\'e Lille 1 CNRS/LIFL, INRIA Lille Nord Europe, Cit\'e scientifique - 59655, Villeneuve d'Ascq cedex, France\\}
\chapter{GPU-accelerated tree-based exact optimization methods}