1. C.M. Benbrook (2001 ) When Does It Pay to Plant Bt Corn? Farm-Level Economic Impacts of Bt Corn, 1996-2001. Minneapolis, USA: Institute for Agriculture and Trade Policy (IATP), p. 4 (http://www.gefoodalert.org/library/admin/uploadedfiles/WhenDoes_It_Pay_to_Plant_Bt_Corn_Farm-Level_Ec.pdf).
2. Biosafety Meeting (1999 )Proceedings of the fifth Central and Eastern European Conference for Regional and International Co-operation on Safety in Biotechnology, December 12-14, Sofia, Bulgaria (http://www.vanolstweb.nl/cee/attachments/Sofia%201999%20summary%20report.doc).
3. Is too much risk assessment risky?