5Kloppenburg,Jack Ralph Jr.,First The Seed: The political economy of plant biotechnology. 1492-2000, New York: Cambridge University Press, 1988 ,p.133.
6Altman, Arie ed,Agricultural Biotechnology, New York: Marcel Dekker(1998).p,648.
7GUAN MING SHI. Intellectual property rights, genetic use restriction technologies (GURTs), and strategic behavior[R]. California:American Agricultural Economics Association, 2006.
8SERGIO H L. Welfare impacts of cross-country spillovers in agricultural research[J]. American Journal of Agricultural Economics, 2008(2) :197-215.
9CGRFA/WG-PGR-1/01/7. Potential impacts of genetic use restriction technologies (GURTs) on agricultural biodiversity and agricultural production systems[R]. Rome:FAO, 2001.
10DANIELL H. Molecular strategies for gene containment in transgenic cropsEJ]. Nat. Biotechnol, 2002 (20) : 581-587.