2Binder DR,Herring IP.Duration of corneal anesthesia following topical administration of 0.5% proparacaine hydrochloride solution in clinically normal cats.[J].Am J Vet Res,2006,67(10):1780-2.
3Henderson ZR,Coster DJ,Wiliam s KA.The long term outcome of limbsl allografts:the search for surviving cells[J].Br J Ophthamlol,2001,85(5):604-609.