1. 1. Gellis S: Personal Communication.
2. 2. Milder B: The lacrimal system. In Silver B et al (eds): Ophthalmic Plastic Surgery. Rochester Minn. Am Acad Ophthalmol Otolaryngol 1977 Chap XVI pp 161-162.
3. 3. Fox SA: Ophthalmic Plastic Surgery 5th ed. New York G rune & Stratton 1 976 pp 590-591 .
4. 4. Jones LT Wobig JL: The lacrimal system. Am Acad Ophthalmol Otolaryngol 83:603-616 1977.
5. 5. Jones LT Wobig JL: Newer concepts of tear duct and eyelid anatomy and treatment. Trans Am Acad Ophthalmol Otolaryngo 283:603-616 1977.