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Raju, Ch; Falmbigl, M.; Rogl, P.; Heinrich, P.; Royanian, E.; Bauer, E.; Mallik, Ramesh Chandra . (2014). Thermoelectric properties of Zn doped Cu2SnSe3. Materials Chemistry and Physics, 147(3), 1022–1028. doi:10.1016/j.matchemphys.2014.06.054 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research