RT Journal Article SR Electronic T1 Tolerance to the effects of morphine on intestinal motility of unanesthetized dogs. JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 515 OP 521 VO 215 IS 2 A1 N W Weisbrodt A1 P J Thor A1 E M Copeland A1 T F Burks YR 1980 UL http://jpet.aspetjournals.org/content/215/2/515.abstract AB