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Cardinale, Bradley J.; Srivastava, Diane S.; Emmett Duffy, J.; Wright, Justin P.; Downing, Amy L.; Sankaran, Mahesh; Jouseau, Claire. (2006). Effects of biodiversity on the functioning of trophic groups and ecosystems. , 443(7114), 989–992. doi:10.1038/nature05202 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research