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Ladislav Bohatý; Peter Held; Petra Becker. (2009). Non-centrosymmetric rubidium rare-earth nitrates Rb2RE(NO3)5 · 4H2O: Crystal growth and optical properties. , 635(13-14), 2236–2241. doi:10.1002/zaac.200801395 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research