1. Al-Ghafiqi M.. Ophthalmic guide. Madrid, Spain: El-Escorial Museum; 1165 AD.
2. Caldwell GW. A new operation for the radical cure of obstruction of the nasal duct. N Y Med J. 1893;58:476.
3. Toti A. Nuovo metodo conservatore di cura radicale delle suppurazioni croniche del sacco lacrimale (dacriocistorinostomia). Clin Mod Firenze. 1904;10:385–7.
4. Dupuy-Dutemps L, Bourguet M. Procede plastique de dacryocystorhinostomie et ses results. Ann Ocul. 1921;158:241–61.
5. Ben Simon GJ, Joseph J, Lee S, et al. External versus endoscopic dacryocystorhinostomy for acquired nasolacrimal duct obstruction in a tertiary referral center. Ophthalmology. 2005;112:1463–8.