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Sehgal, Preeti; Narula, A. K. . (2015). Influence of amines as surfactant on the optical, thermal, and structural properties of nanostructured ZnO. Applied Physics A, 119(4), 1405–1412. doi:10.1007/s00339-015-9113-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research