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Dai, Jun; Zeng, Xiao Cheng . (2014). Bilayer Phosphorene: Effect of Stacking Order on Bandgap and Its Potential Applications in Thin-Film Solar Cells. The Journal of Physical Chemistry Letters, 5(7), 1289–1293. doi:10.1021/jz500409m 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research