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Willander, M; Nur, O; Jain, S C . (2004). Silicon Germanium Strained Layers and Heterostructures. Physica Scripta, T114(), 22–30. doi:10.1088/0031-8949/2004/T114/005 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research