""Inhalers of Dr John Snow: his marks and his score,""
(June 1990)an abstract of a paper delivered at the annual conference of the History of Anaesthesia Society in Huddersfield (UK); Proceedings 8b (June 1990): 81
The editors of the Proceedings added a note to the effect that "Dr. Ellis did not wish to publish a full paper in this Proceedings but consented to the use of this brief abstract."