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          <titl xml:lang="en">Economisch gedrag van regelmatige opiatengebruikers 1987-1989</titl>
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        <AuthEnty xml:lang="en">Grapendaal, H., Leuw, E., Nelen, J.M., Ministerie van justitie * Den Haag, Wetenschappelijk onderzoek- en documentatiecentrum, WODC (primary investigator)
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