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Shuyuan Gan;Xinzhou Zhang;Lan Chen;. (2021). Maintenance optimization of a production system considering defect prevention and spare parts ordering . Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, (), –. doi:10.1177/1748006x211029152 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research