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Qiu, Chunlei; Ravi, G.A.; Dance, Chris; Ranson, Andrew; Dilworth, Steve; Attallah, Moataz M. . (2015). Fabrication of large Ti–6Al–4V structures by direct laser deposition. Journal of Alloys and Compounds, 629(), 351–361. doi:10.1016/j.jallcom.2014.12.234 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research