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Kosateva, Angelina; Stefanova, Maya; Marinov, Stefan; Czech, Jan; Carleer, Robert; Yperman, Jan . (2017). Characterization of organic components in leachables from Bulgarian lignites by spectroscopy, chromatography and reductive pyrolysis. International Journal of Coal Geology, (), S0166516217305244–. doi:10.1016/j.coal.2017.10.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research