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Noma, Taishi; Taguchi, Dai; Manaka, Takaaki; Iwamoto, Mitsumasa . (2019). Study of I-V Hysteresis of Tin Perovskite Solar Cells Using Capacitance-Voltage Measurement Coupled with Charge Modulation Spectroscopy. Molecular Crystals and Liquid Crystals, 686(1), 92–98. doi:10.1080/15421406.2019.1648042 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research