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\bibitem{Broadhead_etal1995} Broadhead, R. S., Heckathorn, D. D., Grund, J. - P. C., Synn Stern, L., \& Anthony, D. L. (1995). Drug Users Versus Outreach Workers in Combating AIDS : Part I: Agency Problems in Traditional Outreach Interventions. \textit{International journal of drug policy}, \textit{6}(3), 178--188.

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