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Qu, Changzheng; Han, Jingwei; Kang, Jing . (2015). Bäcklund Transformations for Integrable Geometric Curve Flows. Symmetry, 7(3), 1376–1394. doi:10.3390/sym7031376 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research