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2. On transplantation of the cornea;von Hippel;Berichte Ophthalmol Gesellschaft Herdelberg,1886
3. 2001 annual report;United Network for Organ Sharing,2001
4. 2002 eye banking statistical report;Eye Bank Association of America,2002
5. Summary of comeal transplant activity Eye Bank Association of America;Aiken-O'Neill;Cornea,2002