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Koc, Husnu; Ozisik, Hacı; Deligöz, Engin; Mamedov, Amirullah M.; Ozbay, Ekmel . (2014). Mechanical, electronic, and optical properties of Bi2S3and Bi2Se3compounds: first principle investigations. Journal of Molecular Modeling, 20(4), 2180–4624. doi:10.1007/s00894-014-2180-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research