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\bibitem{Eisenbach-Stangl+Spirig2011} Eisenbach-Stangl, I., \& Spirig, H. (2011). Policy brief January 2011 (2) : Auch Drogenabh{\"a}ngige werden {\"a}lter... : zur Lebenssituation einer Randgruppe. \textit{Policy brief}, (1(2); 01/2011), 15.

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