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2. World Health Organization, Geneva, 1999. Preventing blindness in children. WHO/PBL/00.77.
3. Sommer Alfred, Davidson Frances R . Assessment and control of vitamin A deficiency: The Annecy Accords. Proceedings of the XX International Vitamin A Consultative Group Meeting. Am Soc Nutr Sci 2002; (Suppl 2): 845S–850S.
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5. Gilbert CE, Foster A . Childhood blindness in the context of VISION 2020 – the Right to Sight. Bull WHO 2001; 79: 227–232.