Khan, Faisal Aziz, Shafaq Pervez Khan Niazi, and Irshad Hussain. 2020. “COMPARISON OF THE EFFICACY OF HYDROXYPROPYL METHYLCELLULOSE DEXTRAN, SODIUM HYALURONATE AND POLYETHYLENE GLYCOL PROPYLENE GLYCOL BASED COMMERCIAL ARTIFICIAL TEAR PRODUCTS USING THE NONINVASIVE TEAR FILM BREAKUP TIME”. Pakistan Armed Forces Medical Journal 70 (1):153-58. https://pafmj.org/PAFMJ/article/view/3954.