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Nicotine self-administration in rats on a progressive ratio schedule of reinforcement.

Donny EC, Caggiula AR, Mielke MM, Booth S, Gharib MA, Hoffman A, Maldovan V, Shupenko C, McCallum SE. Nicotine self-administration in rats on a progressive ratio schedule of reinforcement. Psychopharmacology (Berl). 1999 Nov; 147(2):135-42.

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