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Rani, Rozina Abdul; Zoolfakar, Ahmad Sabirin; O'Mullane, Anthony P.; Austin, Michael W.; Kalantar-Zadeh, Kourosh . (2014). Thin films and nanostructures of niobium pentoxide: fundamental properties, synthesis methods and applications. J. Mater. Chem. A, 2(38), 15683–15703. doi:10.1039/c4ta02561j 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research