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JL, Newman, Vann RE,, EL, May, PM, Beardsley: Heroin discriminative stimulus effects of methadone, LAAM and other isomers of acetylmethadol in rats. In: Psychopharmacology. 164. Jahrgang, Nr.1, 2002, S.108-14, doi:10.1007/s00213-002-1198-8, PMID 12373424.