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Xiaosheng Fang; Jian Yan; Linfeng Hu; Hui Liu; Pooi See Lee. (2012). Thin SnO2 Nanowires with Uniform Diameter as Excellent Field Emitters: A Stability of More Than 2400 Minutes. , 22(8), 1613–1622. doi:10.1002/adfm.201102196 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research