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R Dedryvère; P.E Lippens; J.C Jumas; I Lefebvre-Devos; C Pérez Vicente. (2001). Influence of the sulfur vacancies on the electronic properties of In16Sn4S32. , 3(3), 267–274. doi:10.1016/s1293-2558(00)01137-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research