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Wilder Carrillo–Cabrera; Jan Čurda; Karl Peters; Miroslav Kohout; Hans Georg von Schnering. (2004). Pentalanthanum ethenide(4-) digermanide(4-), La5(C2)Ge2. , 630(13-14), 2186–2190. doi:10.1002/zaac.200400190 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research