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Picetti, R; Caccavo, JA; Ho, A; Kreek, MJ; (2011) Dose escalation and dose preference in extended-access heroin self-administration in Lewis and Fischer rats. Psychopharmacology, 220 (1). pp. 163-72. ISSN 1432-2072 DOI: https://doi.org/10.1007/s00213-011-2464-4 Full text not available from this repository.