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He, Wentao; Wang, Shaoping; Zhang, Chao; Wang, Xi; Liu, Di . (2020). Lubrication and Wear Characteristics of Mechanical Face Seals under Random Vibration Loading. Materials, 13(6), 1285–. doi:10.3390/ma13061285 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research