1. Aubaret E. The valves of the lacrymonasal passages. Arch Ophthalmol. 1908;28:211–36.
2. Whitnall SE. Anatomy of the human orbit and accessory organs of vision. 2nd ed. New York: Krieger Publishing Company; 1979. p. 241–3.
3. Kurihashi K. Ruido no kaibo Ganka. 1996;38:301–13 (Japanese).
4. Burkat CN, Lucarelli MJ. Anatomy of the lacrimal system. In: Cohen AJ, Brazzo B, editors. The lacrimal system: diagnosis, management, and surgery. New York: Springer; 2006. p. 3–19.
5. Katowitz JA, Hollsten DA. Silicone intubation of the nasolacrimal drainage system. In: Linberg JV, editor. Lacrimal surgery. New York: Churchill-Livingstone; 1988. p. 109–23.