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You, Tae-Soo; Grin, Yuri; Miller, Gordon J.. (2007). Planar versus Puckered Nets in the Polar Intermetallic Series EuGaTt (Tt = Si, Ge, Sn). , 46(21), 8801–8811. doi:10.1021/ic701111e 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research