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Niehaus, Thomas A.; Hofbeck, Thomas; Yersin, Hartmut . (2015). Charge-transfer excited states in phosphorescent organo-transition metal compounds: a difficult case for time dependent density functional theory?. RSC Adv., 5(78), 63318–63329. doi:10.1039/C5RA12962A 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research