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\bibitem{Ingold+Piguet1993} Ingold, J. - L., \& Piguet, B. (1993). \textit{Enqu{\^e}te sur les pi{\`e}ges de la m{\'e}thadone}  (E. Burnand, Ed.). Gen{\`e}ve: T{\'e}l{\'e}vision Suisse Romande (TSR).

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