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Marcus Tegel; Franziska Hummel; Sebastian Lackner; Inga Schellenberg; Rainer Pöttgen; Dirk Johrendt. (2009). The Layered Iron Arsenide Oxides Sr2CrO3FeAs and Ba2ScO3FeAs. , 635(13-14), 2242–2248. doi:10.1002/zaac.200900203 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research