Acharya, K, et al. “Comparison of Outcome Following Endoscopic Dacryocystorhinostomy With External Dacryocystorhinostomy”. Nepalese Journal of ENT Head and Neck Surgery, vol. 2, no. 2, Sept. 2012, pp. 2-3, doi:10.3126/njenthns.v2i2.6791.