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Balanay, Mannix P.; Kim, Dong Hee . (2011). Computational Study of Absorption Energies of Organic Sensitizers Used in Photovoltaic Applications. The Journal of Physical Chemistry C, 115(39), 19424–19430. doi:10.1021/jp205512v 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research