^Gasior M, Paronis CA, Bergman J (January 2004). "Modification by dopaminergic drugs of choice behavior under concurrent schedules of intravenous saline and food delivery in monkeys". The Journal of Pharmacology and Experimental Therapeutics. 308 (1): 249–59. doi:10.1124/jpet.103.052795. PMID14563783. S2CID5879400.