1. Sommer A: Cataracts as an epidemiologic problem. Am J Ophthalmol 83:334?339, 1977
2. Johnson JD, Kretchmer N, Simoons FJ: Lactose malabsorption: Its biology and history. Pediatrics 21:197?237, 1974
3. Kretchmer N: The geography and biology of lactose digestion and malabsorption. Postgrad Med J 53 (Suppl 2):65?72, 1977
4. Simoons FJ: The geographic hypothesis and lactose malabsorption: A weighing of the evidence. Am J Dig Dis 23:963?980, 1978
5. McLaren DS, Halasa A: Nutritional and metabolic cataract.In Cataract and Abnormalities of the Lens, JG Bellows (ed). New York, Grune & Stratton, 1975, pp 255?264