1. Schifrin, L. G., and Rich, W. J.: The Contact Lens Industry. Structure, Competition, and Public Policy (health technology case study 31). United States Congress, Office of Technology Assessment, November 1984.
2. Corneal endothelium in veteran PMMA contact lens wearers;Schoessler;Int. Contact Lens Clin.,1981
3. Specular microscopy of hard contact lens wearers;Hirst;Ophthalmology,1984
4. The effect of long-term hard contact lens wear on the corneal endothelium;Mac Rae;C.L.A.O. J.,1985
5. Pseudophakic bullous keratopathy. Relationship to preoperative corneal endothelial status;Rao;Ophthalmology,1984