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\bibitem{Vallette+etal.2004} Vallette, M., \& et al. (2004). \textit{Rep{\`e}re social No. 56 : Mutations : syst{\`e}mes qualit{\'e} et contrats de prestations}. Gen{\`e}ve: Service de l{\textquoteright}information sociale de l{\textquoteright}Hospice g{\'e}n{\'e}ral.

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