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Zuo, Wenjie; Saitou, Kazuhiro . (2017). Multi-material topology optimization using ordered SIMP interpolation. Structural and Multidisciplinary Optimization, 55(2), 477–491. doi:10.1007/s00158-016-1513-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research