1. Relaxing incision for control of postoperative astigmatism following keratoplasty;Troutman;Ophthalmic Surg,1980
2. Astigmatic considerations in corneal graft;Troutman;Ophthalmic Surg,1979
3. Variation in corneal graft size related to trephine technique;Olson;Arch Ophthalmol,1979
4. Refractive variation and donor tissue size in aphakic keratoplasty; a prospective randomized study;Olson;Arch Ophthalmol,1979
5. The effect of scleral fixation ring placement and trephine tilting on keratoplasty wound size and donor shape;Olson;Ophthalmic Surg,1981