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Michael H Palmer. (2004). The structures of the azido-, isocyanato- and isothiocyanato-derivatives of germane, stannane and plumbane and their trimethyl derivatives: a comparison of ab initio results with experiment, and with the methane and silane analogs. , 692(1-3), 43–56. doi:10.1016/j.molstruc.2003.12.028 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research