Gupta, R., Sharma, B., Anand, R., Bawaria, S., & Dewada, R. (2013). Association of Asthenopia and Convergence Insufficiency in Children with Refractive Error- A hospital based study. International Journal of Medical Research and Review, 1(5), 222-227. https://doi.org/10.17511/ijmrr.2013.i05.02