J D Murphy, K Henderson, M I Bowden, M Lewis, G M Cooper
Murphy J D, Henderson K, Bowden M I, Lewis M, Cooper G M.
Bupivacaine versus bupivacaine plus fentanyl for epidural analgesia: effect on maternal satisfaction.
British Medical Journal 1991; 302 :564
doi:10.1136/bmj.302.6776.564