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Zhiwei Xu, Bing Hou, Yan Gao, Fuchu He, Chenggang Zhang: Effects of enriched environment on morphine-induced reward in mice. In: Experimental Neurology. 204, 2007, S. 714, 10.1016/j.expneurol.2006.12.027Архивная копия от 29 апреля 2019 на Wayback Machine