Sommerville, R.A., Farquhar, C.F. and Birkett, C.R. 1997. Prospects For a Preclinical Diagnostic Test. The Bovine Practitioner. 1997, 31.2 (May 1997), 77–78. DOI:https://doi.org/10.21423/bovine-vol1997no31.2p77-78.