1. The consecutive implantation of 250 Shearing intraocular lenses;Kratz;Contact and I ntraocular Lens Med J,1979
2. Kratz RP, Colvard DM: Phacoemulsification in the posterior chamber. Ophthahnol, in press
3. Intraocular lens implantation from Ridley to the present; my 25 years experience;Perritt;Int Ophthalmol Clin,1979
4. A Practical Posterior Lens;Shearing,1979