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Li, Meng; Sadoughi, Mohammadkazem; Hu, Zhen; Hu, Chao . (2020). A hybrid Gaussian process model for system reliability analysis. Reliability Engineering & System Safety, 197(), 106816–. doi:10.1016/j.ress.2020.106816 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research