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Marczenko, Zygmunt. (2000). [Analytical Spectroscopy Library] Separation, Preconcentration and Spectrophotometry in Inorganic Analysis Volume 10 || Principles of Spectrophotometry. , (), 26–38. doi:10.1016/S0926-4345(00)80066-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research