1. Occurrence of squint: a clinical-statistical study on the prevalence of squint and associated signs in different groups and ages of the Danish population;Frandsen;Acta Ophthalmol Suppl,1960
2. Squint—the frequency of onset at different ages, and the incidence of some associated defects in a Swedish population;Nordlow;Acta Ophthalmol,1964
3. Epidemiology of strabismus;Graham;Br J Ophthalmol,1974
4. Ophthalmic screening of 38,000 children, age 1 to 2 1/2 years, in child welfare clinics;Friedman;J Pediatr Ophthalmol Strabismus,1980
5. Incidence and types of childhood exotropia: a population-based study;Govindan;Ophthalmology,2005