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Huang, Xin-yue; You, Min; Ran, Guang-liu; Fan, Hao-ran; Zhang, Wen-kai . (2018). Ester-Derivatized indoles as fluorescent and infrared probes for hydration environments. Chinese Journal of Chemical Physics, 31(4), 477–484. doi:10.1063/1674-0068/31/cjcp1805118 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research