1. Report of the Eighth Meeting of the WHO Programme Advisory Group on the Prevention of Blindness,1989
2. Bowman Lecture. The conquest of cataract: a global challenge;Kupfer;Trans Ophthalmol Soc UK,1984
3. Cataracts and macular degeneration in older Americans;Klein;Arch Ophthalmol,1982
4. Senile lens and senile macular changes in a population-based sample;Sperduto;Am J Ophthalmol,1980
5. Total digit dialing for a small area census by phone;Campbell,1988