Pokharel, A., P. Pokharel, H. Das, and S. Adhikari. “The Patterns of Refractive Errors Among the School Children of Rural and Urban Settings in Nepal”. Nepalese Journal of Ophthalmology, vol. 2, no. 2, Sept. 2010, pp. 114-20, doi:10.3126/nepjoph.v2i2.3717.