1Hobbs, Jill E. Information Asymmetry and the Role of Traceabiliy System[J]. Agribuginess. Vol. 20 (4), also Published online in Wiley InterScience (www. interscience. wiley.com), 2004, 397-415.
2Segerson, K. Mandatory versus Voluntary Approaches to Food Safety[J]. Agribusiness, 1999, (15), 53-70.