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Peale, D. R.; Haight, R.; Ott, J. . (1993). Heteroepitaxy of β-FeSi2 on unstrained and strained Si(100) surfaces. Applied Physics Letters, 62(12), 1402–. doi:10.1063/1.108693 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research