1. A history of the discovery of modern anaesthesia;Bigelow,1876
2. Anaesthesia as a specialty: past, present and future;Calverley,1992
3. The structure of scientific revolutions;Kuhn,1996
4. Changing concepts concerning depth of anaesthesia;Woodbridge;Anaesthesiology,1957
5. Anaesthesia: a practical or impractical construct?;Prys-Roberts;Br J Anaesth,1987