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	1.	Rat ultrasonic vocalizations demonstrate that the motivation to contextually reinstate cocaine-seeking behavior does not necessarily involve a hedonic response. [electronic resource] by Barker, David J Bercovicz, Danielle Servilio, Lisa C Simmons, Steven J Ma, Sisi Root, David H Pawlak, Anthony P West, Mark O Producer: 20150511 In: Addiction biology vol. 19 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Ultrasonic vocalizations: evidence for an affective opponent process during cocaine self-administration. [electronic resource] by Barker, David J Simmons, Steven J Servilio, Lisa C Bercovicz, Danielle Ma, Sisi Root, David H Pawlak, Anthony P West, Mark O Producer: 20150219 In: Psychopharmacology vol. 231 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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