1. 1. Parks MM: Etiologie and Compensatory Factors of Comitant Horizontal Deviations in Children. Strabismus Mosby 1962 p 38.
2. 2. Guibor GP: Squint Gruñe and Stratton 1959 p viii 132.
3. 3. Abercrombie MLJ: Eye movements and preceptual development. In Gardiner P (ed) Aspects of Developmental and Pediatric Ophthalmology. Lavenham Press Ltd. Suffolk 1969 p 15.
4. 4. Jampolsky A: Ocular divergence mechanisms. Trans Am Ophthalmol Soc 1970 Toronto Press p 730.
5. 5. Costenbader F: Clinical course and management. of Esotropia. In Allen J (ed) Strabismus Symposium II. Mosby 1958 p 337 353.