Robertson, K M. “Case Report: Improvement of Visual Function of a Cerebral Palsied Child With Periodic Exotropia of the Divergence Excess Type”. Canadian Journal of Optometry 46, no. 1 (March 1, 1984). Accessed January 31, 2026. https://www.cjo-rco.ca/index.php/cjo/article/view/4334.