1. Ingelfinger FJ: Digestive disease as a national problem. V. Gallstones. Gastroenterology 55:102, 1968
2. Miyake H, Johnston CG: Gallstones: ethnological studies. Digestion 1:219, 1968
3. Budd G: On Diseases of the Liver. Second edition. Philadelphia, Blanchard and Lea, 1853, p 468
4. Thudichum JLW: A Treatise on Gall-Stones: Their Chemistry, Pathology and Treatment. London, J. Churchill and Sons, 1863, p 323
5. Isaksson B: On the lipid constituents of normal bile. Upsala Läkaref Förh 56:177, 1952