1. Methadone plasma levels and analgesia in postoperative cancer patients;Kaiko,1982
2. Postoperative demand analgesia;Keeri-Szanto;Surg. Gynec. Obstet.,1972
3. A Synopsis of Anaesthesia;Lee,1973
4. Generalised Linear Models;McCullagh,1984
5. Some patients don't need analgesics after surgery;McQuay;J. Roy. Soc. Med.,1982