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Zhang, Qiang; Yao, Yi; Zhou, Dongsheng; Liu, Rui . (2015). Motion Key-Frame Extraction by Using Optimized t-Stochastic Neighbor Embedding. Symmetry, 7(2), 395–411. doi:10.3390/sym7020395 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research