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Qiaohui Li;Yixin Dong;Guangwei Lv;Tingting Liu;Di Lu;Nan Zheng;Xiyue Dong;Zhiyuan Xu;Zengqi Xie;Yongsheng Liu;. (2021). Fluorinated Aromatic Formamidinium Spacers Boost Efficiency of Layered Ruddlesden–Popper Perovskite Solar Cells . ACS Energy Letters, (), –. doi:10.1021/acsenergylett.1c00620 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research