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Deepananda Herath; Alfons Weersink. (2009). From Plantations to Smallholder Production: The Role of Policy in the Reorganization of the Sri Lankan Tea Sector. , 37(11), 1759–1772. doi:10.1016/j.worlddev.2008.08.028 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research