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Huo, Xinming; Song, Yimin . (2018). Finite Motion Analysis of Parallel Mechanisms with Parasitic Motions Based on Conformal Geometric Algebra. Advances in Applied Clifford Algebras, 28(1), 21–. doi:10.1007/s00006-018-0832-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research