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Schoeftner, J; Irschik, H . (2009). Passive damping and exact annihilation of vibrations of beams using shaped piezoelectric layers and tuned inductive networks. Smart Materials and Structures, 18(12), 125008–. doi:10.1088/0964-1726/18/12/125008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research