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Gui-jiang Li; Jun Wang; Cong Li; Qian Peng; Jian Gao; Bao-luo Shen. (2008). Microstructure and dry-sliding wear properties of DC plasma nitrided 17-4 PH stainless steel. , 266(9), 1964–1970. doi:10.1016/j.nimb.2008.02.073 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research