RT Journal Article SR Electronic T1 Analgesic Potency of Intrathecal Tramadol and Morphine JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 53 OP 53 DO 10.1136/rapm-00115550-199520021-00053 VO 20 IS Suppl 2 A1 Timothy R Lubenow A1 Robert J McCarthy A1 Jeffrey Kroin A1 Anthony D Ivankovich YR 1995 UL http://rapm.bmj.com/content/20/Suppl_2/53.abstract AB