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Syahriza Ismail; Zainal A. Ahmad; Andrey Berenov; Zainovia Lockman. (2011). Effect of applied voltage and fluoride ion content on the formation of zirconia nanotube arrays by anodic oxidation of zirconium. , 53(4), 0–1164. doi:10.1016/j.corsci.2010.11.044 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research