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Trujillo-Pisanty, Ivan and Hernandez, Giovanni and Moreau-Debord, Ian and Cossette, Marie-Pierre and Conover, Kent and Cheer, Joseph F. and Shizgal, Peter (2011) Cannabinoid receptor blockade reduces the opportunity cost at which rats maintain operant performance for rewarding brain stimulation. Journal of Neuroscience, 31 (14). pp. 5426-5435. ISSN 0270-6474