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Journal of the American Optometric Association|September 1, 1979
The incidence of visual anomalies in a population of cerebral palsied childrenR DuckmanJournal of the American Optometric Association|June 1, 1978
Convergence insufficiency: incidence, diagnosis, and treatmentJ Cooper, R DuckmanJournal of the American Optometric Association|November 1, 1987
Divergence excess exotropiaB S Kran, R DuckmanPageof 1