1. Essays on the first hundred years of anesthesia;Sykes,1982
2. Artificial anaesthesia and anaesthetics;Lyman,1881
3. Laryngeal mask anesthesia: principles and practice;Brimacombe,2005
4. Clearing the airway: the development of the pharyngeal airway;Ball;Anesth Intensive Care,1997
5. A non-traumatic pharyngeal airway;Gudel;JAMA,1933