1. Canadian Cattle Identification Agency (CCIA) 2002 Rationale: Why do we need to identify cattle? http://www.canadaid.com/about/rationale.shtml
2. Commission of the European Communities 1999 http://europa.eu.int/eur-lex/en/com/pdf/1999/com1999_0486en01.pdf
3. Free competition and the optimal amount of fraud;Darby;Journal of Law and Economics,1973
4. Meat traceability: Are U.S. consumers willing to pay for it?;Dickinson;Journal of Agricultural and Resource Economics,2002