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Nanni, Loris; Brahnam, Sheryl . (2017). Multi-Label Classifier Based on Histogram of Gradients for Predicting the Anatomical Therapeutic Chemical Class/Classes of a Given Compound. Bioinformatics, (), –. doi:10.1093/bioinformatics/btx278 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research