Bedford, P. G. C (1992) '''Ocular diseases'''. ''Bovine medicine: diseases and husbandry'', Wiley-Blackwell, Oxford, pp712-721; 27 | Bedford, P. G. C (1992) '''Ocular diseases'''. ''Bovine medicine: diseases and husbandry'', Wiley-Blackwell, Oxford, pp712-721; 27 |