Tasman William, Jaeger Edward A. The Wills Eye Hospital- Atlas of Clinical Ophthalmology Second Edition. Lippincott Williams & Wilkins, a Wolters Kluwer business 2001. P 382. Yanoff Myron, Duker Jay S. Ophthalmology Third Edition. Mosby Elsevier 2009. P 1429. Blodi FC, Mackensen G, Neubauer H. Surgical Ophthalmology 1..