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2. L-tryptophan decreases the breaking point under a progressive ratio schedule of intravenous cocaine reinforcement in the rat. McGregor A, Lacosta S, Roberts DC. Pharmacol Biochem Behav; 1993 Mar; 44(3):651-5. PubMed ID: 8451268 [Abstract] [Full Text] [Related]
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19. Progressive ratio and fixed ratio schedules of cocaine-maintained responding in baboons. Griffiths RR, Bradford LD, Brady JV. Psychopharmacology (Berl); 1979 Oct; 65(2):125-36. PubMed ID: 117480 [Abstract] [Full Text] [Related]