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Di Falco, S.; Veronesi, M.; Yesuf, M. . (2011). Does Adaptation to Climate Change Provide Food Security? A Micro-Perspective from Ethiopia. American Journal of Agricultural Economics, 93(3), 829–846. doi:10.1093/ajae/aar006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research