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2. Long term progression of astigmatism after penetrating keratoplasty for keratoconus: evidence of late recurrence;de Toledo;Cornea,2003
3. Suture erosion after penetrating keratoplasty;Dana;Cornea,1995
4. Sterile ocular inflammatory reaction to monofilament suture material;Sullivan;Aust N Z J Ophthalmol,1994
5. Manufacturers' specifications;Alcon Laboratories,1998