RT Journal Article SR Electronic T1 Relative Reinforcing Effects of Cocaine, Remifentanil, and Their Combination in Rhesus Monkeys JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics DO 10.1124/jpet.105.100461 A1 Gail Winger A1 Chad M. Galuska A1 Steven R. Hursh A1 James H. Woods YR 2006 UL http://jpet.aspetjournals.org/content/early/2006/03/29/jpet.105.100461.abstract AB