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Salvatore D. Lepore; Deboprosad Mondal; Song Ye Li; Anjan K. Bhunia. (2008). Stereoretentive Halogenations and Azidations with Titanium(IV) Enabled by Chelating Leaving Groups. , 47(39), 7511–7514. doi:10.1002/anie.200802472 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research