9Hennessy, David A. , Jutta Roosen and John A. Miranowski. Leadership and the Provision of Safe Food, American Journal of Agricultural Economics, 2001, vol. 83 (4) :862 - 874, November
10Vetter, Henrik and Kostas Karantininis. Moral Hazard, Vertical Integration, and Public Monitoring in Credence Goods. European Review of Agricultural Economics 2002, 29, (2) : 271 -279