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F. Rubio-Marcos; J.J. Romero; M.G. Navarro-Rojero; J.F. Fernandez. (2009). Effect of ZnO on the structure, microstructure and electrical properties of KNN-modified piezoceramics. , 29(14), 3045–3052. doi:10.1016/j.jeurceramsoc.2009.04.026 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research