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Dong-Hee Kang; Thomas Schleid. (2009). Pr4S3[AsS3]2: Praseodym(III)-Sulfid-Thioarsenat(III) mit Ketten und Schichten aus kondensierten [SPr4]-Tetraedern. , 635(13-14), 2170–2176. doi:10.1002/zaac.200900225 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research