1. Wilson, R. G. et al. Weed Technol. 21, 900–909 (2007).
2. Brookes, G. & Barfoot, P. GM Crops Food; preprint at http://go.nature.com/q8rmke (2013).
3. Mortensen, D., Egan, J. F., Maxwell, B. D., Ryan, M. R. & Smith, R. G. BioScience 62, 75–84 (2012).
4. Gruère, G. P., Mehta-Bhatt, P. & Sengupta, D. Bt Cotton and Farmer Suicides in India. Discussion paper 00808 (International Food Policy Research Institute, 2008).
5. Gruère, G. & Sengupta, D. J. Dev. Stud. 47, 316–337 (2011).