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Marques, António Cardoso; Fuinhas, José Alberto; Menegaki, Angeliki N. . (2014). Interactions between electricity generation sources and economic activity in Greece: A VECM approach. Applied Energy, 132(), 34–46. doi:10.1016/j.apenergy.2014.06.073 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research