1. Hunter, John (1778), quoted in “Stomach and Duodenum” by Eusterman, G. B. and Balfour, C. D. W. B. Saunders Co., 1935; page 6.
2. Cruveillier, Jean, Anatomie pathologique du corps humain, Paris 1830–1842; Diseases of the Stomach, Section VII.
3. Beaumont, William, Experiments and Observations on the Gastric Juice and the Physiology of Digestion. Plattsburgh, F. P. Allen, 1833. pp. 228–229.
4. Cruveillier, J., quoted by Brown, Ralph C. in “Ulcer of the Stomach and Duodenum,” Oxford Medicine, Vol. Ill, Part 1, p. 161. Vd. infra also (2) p. 124.
5. Babkin, B. P., Secretory Mechanism of the Digestive Glands, Paul B. Hoeber, 1944, p. 352. b) idem, p. 46.