Insect-resistant varieties show big yield improvements.
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References
Qaim, M. & Zilberman, D. Yield effects of genetically modified crops in developing countries. Science, 299, 900 - 902, (2003).
Carrière, Y. et al. Long-term regional suppression of pink bollworm by Bacillus thuringiensis cotton. Proceeding of the National Academy of Sciences, published online, doi:10.1073/pnas.0436708100 (2003).
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Whitfield, J. Transgenic cotton a winner in India. Nature (2003). https://doi.org/10.1038/news030203-12
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DOI: https://doi.org/10.1038/news030203-12