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Constantin Baron Ettingshausen. (1878-1879). Report on Phyto-Palaeontological Investigations Generally and on Those Relating to the Eocene Flora of Great Britain in Particular. Proceedings of the Royal Society of London, 28(), 221–228. doi:10.2307/113820 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research