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Birka, Marvin; Roscher, Jörg; Holtkamp, Michael; Sperling, Michael; Karst, Uwe . (2016). Investigating the stability of gadolinium based contrast agents towards UV radiation. Water Research, 91(), 244–250. doi:10.1016/j.watres.2016.01.012 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research