RT Journal Article SR Electronic T1 USE OF DIFFERENTIAL BAR-PRESSING RATES OF RATS FOR SCREENING ANALGESIC DRUGS. I. TECHNIQUES AND EFFECTS OF MORPHINE JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 388 OP 397 VO 120 IS 3 A1 Hill, Harris E. A1 Pescor, Frank T. A1 Belleville, Richard E. A1 Wikler, Abraham YR 1957 UL http://jpet.aspetjournals.org/content/120/3/388.abstract AB