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Tšugai, Alina; Plado, Jüri; Jõeleht, Argo; Kriiska, Aivar; Mustasaar, Mario; Raig, Hanna; Risberg, Jan; Rosentau, Alar . (2014). Ground-penetrating Radar and Geological Study of the Kudruküla Stone Age Archaeological Site, Northeast Estonia. Archaeological Prospection, 21(3), 225–234. doi:10.1002/arp.1484 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research