Olson, D. P., Duren, E. P., Bramwell, K. A., Henson, S. R., Panting, R. R., Ritter, T. W. and Sharp, D. W. (1989) “Clinical observations and laboratory analysis of factors that affect the survival and performance of beef cattle”, The Bovine Practitioner, (24), pp. 4–11. doi: 10.21423/bovine-vol0no24p4-11.