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Wikler, A., Martin, W.R., Pescor, F.T. et al. Factors regulating oral consumption of an opioid (etonitazene) by morphine-addicted rats. Psychopharmacologia 5, 55–76 (1963). https://doi.org/10.1007/BF00405575
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DOI: https://doi.org/10.1007/BF00405575