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Lauermann, Thomas; Fröhlich, Benjamin; Hahn, Giso; Terheiden, Barbara . (2015). Diffusion-based model of local Al back surface field formation for industrial passivated emitter and rear cell solar cells. Progress in Photovoltaics: Research and Applications, 23(1), 10–18. doi:10.1002/pip.2388 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research