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Huang, Shih-Huang; Nesterov, Vladimir N.; Richmond, Michael G. . (2014). New azido-substituted tantalum compounds: syntheses and DFT examination of nitrogen-rich mono-, di-, and trinuclear tantalum(v) compounds. Dalton Transactions, 43(9), 3453–. doi:10.1039/C3DT53101E 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research