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Hoang, Nam; Fujino, Yozo . (2008). Combined Damping Effect of Two Dampers on a Stay Cable. Journal of Bridge Engineering, 13(3), 299–303. doi:10.1061/(asce)1084-0702(2008)13:3(299) 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research