Sheikh, Naveen, Massiha Ahmed, Nayab Masood, Nayab Malik, Huma Khan, and Shahid Hasan. “Sleep Deprivation and Extraocular Muscles: A Cross Sectional Study”. Pakistan Journal of Physiology 16, no. 1 (March 31, 2020): 20-23. Accessed October 28, 2020. http://pjp.pps.org.pk/index.php/PJP/article/view/1174.