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2. Bradley Burton:The Medical Journal of Australia October 3 1914 page338.
3. Cleland J. B.: “Second Annual Report of the Bureau of Micro‐Biology ”New South Wales.
4. Collins H. R.:Journal of Infectious Diseases November 25 1905(quoted byH. de R.Morgan The British Medical Journal April 21 1906 page908).
5. Davison W. C.:Bulletin of the Johns Hopkins Hospital July 1920 page225.