Petrie, B. F (2016). "Environment is not the Most Important Variable in Determining Oral Morphine Consumption in Wistar Rats". Psychological Reports. 78 (2): 391–400. doi:10.2466/pr0.1996.78.2.391. PMID9148292. S2CID45068460.
Bozarth, M. A; Murray, A; Wise, R. A (1989). "Influence of housing conditions on the acquisition of intravenous heroin and cocaine self-administration in rats". Pharmacology Biochemistry and Behavior. 33 (4): 903–7. doi:10.1016/0091-3057(89)90490-5. PMID2616610. S2CID6910048.
Xu, Zhiwei; Hou, Bing; Gao, Yan; He, Fuchu; Zhang, Chenggang (2007). "Effects of enriched environment on morphine-induced reward in mice". Experimental Neurology. 204 (2): 714–9. doi:10.1016/j.expneurol.2006.12.027. PMID17331503. S2CID43363493.
Eitan, Shoshana; Emery, Michael A; Bates, M.L.Shawn; Horrax, Christopher (2017). "Opioid addiction: Who are your real friends?". Neuroscience & Biobehavioral Reviews. 83: 697–712. doi:10.1016/j.neubiorev.2017.05.017. PMID28552458. S2CID36995951.
Alexander, Bruce K; Schweighofer, Anton R. F (1988). "Defining 'addiction'". Canadian Psychology. 29 (2): 151–62. doi:10.1037/h0084530.
Petrie, B. F (2016). "Environment is not the Most Important Variable in Determining Oral Morphine Consumption in Wistar Rats". Psychological Reports. 78 (2): 391–400. doi:10.2466/pr0.1996.78.2.391. PMID9148292. S2CID45068460.
Bozarth, M. A; Murray, A; Wise, R. A (1989). "Influence of housing conditions on the acquisition of intravenous heroin and cocaine self-administration in rats". Pharmacology Biochemistry and Behavior. 33 (4): 903–7. doi:10.1016/0091-3057(89)90490-5. PMID2616610. S2CID6910048.
Xu, Zhiwei; Hou, Bing; Gao, Yan; He, Fuchu; Zhang, Chenggang (2007). "Effects of enriched environment on morphine-induced reward in mice". Experimental Neurology. 204 (2): 714–9. doi:10.1016/j.expneurol.2006.12.027. PMID17331503. S2CID43363493.
Eitan, Shoshana; Emery, Michael A; Bates, M.L.Shawn; Horrax, Christopher (2017). "Opioid addiction: Who are your real friends?". Neuroscience & Biobehavioral Reviews. 83: 697–712. doi:10.1016/j.neubiorev.2017.05.017. PMID28552458. S2CID36995951.
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Petrie, B. F (2016). "Environment is not the Most Important Variable in Determining Oral Morphine Consumption in Wistar Rats". Psychological Reports. 78 (2): 391–400. doi:10.2466/pr0.1996.78.2.391. PMID9148292. S2CID45068460.
Bozarth, M. A; Murray, A; Wise, R. A (1989). "Influence of housing conditions on the acquisition of intravenous heroin and cocaine self-administration in rats". Pharmacology Biochemistry and Behavior. 33 (4): 903–7. doi:10.1016/0091-3057(89)90490-5. PMID2616610. S2CID6910048.
Xu, Zhiwei; Hou, Bing; Gao, Yan; He, Fuchu; Zhang, Chenggang (2007). "Effects of enriched environment on morphine-induced reward in mice". Experimental Neurology. 204 (2): 714–9. doi:10.1016/j.expneurol.2006.12.027. PMID17331503. S2CID43363493.
Eitan, Shoshana; Emery, Michael A; Bates, M.L.Shawn; Horrax, Christopher (2017). "Opioid addiction: Who are your real friends?". Neuroscience & Biobehavioral Reviews. 83: 697–712. doi:10.1016/j.neubiorev.2017.05.017. PMID28552458. S2CID36995951.