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Gherghel, Andreea; Teodosiu, Carmen; De Gisi, Sabino . (2019). A review on wastewater sludge valorisation and its challenges in the context of circular economy. Journal of Cleaner Production, (), S0959652619313319–. doi:10.1016/j.jclepro.2019.04.240 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research