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\bibitem{Wicki+Friedrich1997} Wicki, W., \& Friedrich, R. (1997). \textit{Zusatzerhebung zur Evaluation des Projekts {\textquotedblleft}Suchtpr{\"a}vention in Kinder- und Jugendheimen{\textquotedblright} ({\textquotedblleft}Le fil rouge{\textquotedblright})}. Bern: Universit{\"a}t Bern, Institut f{\"u}r Psychologie.

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