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\bibitem{Ackermann_etal2010} Ackermann, B., Cotting, P., Galley, L., Arag{\'o}n, M., \& M{\"u}ller, G. (2010). \textit{Bulletin et rapport d{\textquoteright}activit{\'e} 2009}  (P. Cotting, Ed.). Fribourg: Reper.

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