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. "2 Environmental Impacts of Genetically Engineered Crops at the Farm Level." Impact of Genetically Engineered Crops on Farm Sustainability in the United States. Washington, DC: The National Academies Press, 2010.
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Zwahlen, C., A. Hilbeck, R. Howald, and W. Nentwig. 2003. Effects of transgenic Bt corn litter on the earthworm Lumbricus terrestris. Molecular Ecology 12(4):1077–1086.
Zwahlen, C., A. Hilbeck, and W. Nentwig. 2007. Field decomposition of transgenic Bt maize residue and the impact on non-target soil invertebrates. Plant and Soil 300(1–2):245–257.