Characterization of maternal motivation in the lactating rat: Contrasts between early and late postpartum responses von Wansaw, Michael P., Pereira, Mariana, Morrell, Joan I.

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Incentive salience of cocaine across the postpartum period of the female rat von Seip, Katharine M., Pereira, Mariana, Wansaw, Michael P., Reiss, Jenny I., Dziopa, Eugenia I., Morrell, Joan I.

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Plasma cocaine levels, metabolites, and locomotor activity after subcutaneous cocaine injection are stable across the postpartum period in rats von Wansaw, Michael P., Lin, Shen-Nan, Morrell, Joan I.

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Relative reinforcing strength of heroin and butorphanol under a concurrent schedule of food and drug availability: effects of varying response requirement von Wansaw, Michael P., Paronis, Carol A

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