1. Quain Richard: Villous tumour. In: Diseases of the rectum, 2nd edition 1855. Walton and Maberly. London, p 295–298.
2. Quain Richard: Illustrations of a peculiar bleeding tumour of the rectum. Walton and Maberly, London 1855.
3. Fitzgerald MG: Extreme fluid and electrolyte loss due to villous papillomae of the rectum. Br Med J. 1: 831–832. 1955.
4. Cooling C and Marrack D: Potassium secreting tumour of the colon. Proc Roy Soc Med. 50: 272–274, 1957.
5. Roy AD and Ellis H: Potassium secreting tumours by the large intestine. Lancet, 759–760, April 11, 1959.