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Si-Fu Tang; Jun-Ling Song; Jiang-Gao Mao. (2006). Syntheses, Crystal Structures, and Characterizations of a Series of New Layered Lanthanide Carboxylate-Phosphonates. , 2006(10), 2011–2019. doi:10.1002/ejic.200600039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research