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\bibitem{Officefederaldestransports2008} Office f{\'e}d{\'e}ral des transports. (2008). \textit{Tol{\'e}rance z{\'e}ro pour les drogues et l{\textquoteright}alcool chez les m{\'e}caniciens de locomotive : l{\textquoteright}OFT fixe les limites}. Berne: Office f{\'e}d{\'e}ral des transports (OFT).

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