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3. Continuous spinal anaesthesia or continuous epidural anaesthesia for post-operative pain control after hip replacement?;Möllmann;Eur J Anaesth,1999
4. Technical problems and side effects associated with continuous intrathecal or epidural post-operative analgesia in patients undergoing hip arthroplasty;Niemi;Eur J Anaesth,1994
5. Determination of the minimum local analgesic concentrations of epidural bupivacaine and lidocaine in labor;Columb;Anesth Analg,1995