1. Preservation of bull sperm at —79° centigrade;Polge;Vet. Record,1952
2. Effect of quick freezing at very low temperature of donor tissue in corneal transplants;Smelser;Proc. Soc Exp. Biol. Med.,1946
3. Three unusual corneal grafts;Rycroft;Brit. J. Ophth.,1957
4. Preservation of corneal grafts by freezing;Eastcott;Lancet,1954
5. Problem of prolonged storage of the cornea;Smith;Int. Ophth. Clin.,1962