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Lu, Wei; Xue, Yingjie; Yeung, Yuileong; Liu, Hongmei; Huang, Jiwu; Shi, Yun . (2019). Secure Halftone Image Steganography Based on Pixel Density Transition. IEEE Transactions on Dependable and Secure Computing, (), 1–1. doi:10.1109/TDSC.2019.2933621 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research