Rizvi, S., Saquib, M., Gupta, Y., Maheshwari, R., & Maheshwari, P. (2017). Functional Outcome in Primary Nasolacrimal Duct Obstruction after Successful External Dacryocystorhinostomy Surgery. Asian Journal of Ophthalmology, 15(3). https://doi.org/10.35119/asjoo.v15i3.262