1. A practical tool for locomotion scoring in sheep: reliability when used by veterinary surgeons and sheep farmers
2. Breeding for Disease Resistance in Farm Animals;Bishop,2010
3. The environment and disease: association or causation?;Bradford Hill;Proc. R. Soc. Med.,1965
4. Multivariate Dependencies—Models, Analysis and Interpretation;Cox,1996
5. Veterinary Epidemiologic Research;Dohoo,2003