1. An open comparison between routine and self-administered postoperative pain relief;Slattery;Annals of the Royal College of Surgeons of England,1965
2. Patient controlled analgesia;Rosen;British Medical Journal,1984
3. Patient controlled analgesia; a new concept of pain relief;Bennett;Annals of Surgery,1982
4. Efficacy of patient controlled versus conventional analgesia for postoperative pain;Bollish;Clinical Pharmacy,1985
5. Nausea and vomiting with use of a patient controlled analgesia system;Robinson;Anaesthesia,1991