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Ke, Weijun; Stoumpos, Constantinos C.; Spanopoulos, Ioannis; Chen, Michelle; Wasielewski, Michael R.; Kanatzidis, Mercouri G. . (2018). Diammonium Cations in the FASnI <sub/>3</sub> Perovskite Structure Lead to Lower Dark Currents and More Efficient Solar Cells. ACS Energy Letters, (), 1470–1476. doi:10.1021/acsenergylett.8b00687 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research