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András P. Schubert; Gábor A. Schubert. (1997). Inorganica Chimica Acta: its publications, references and citations. An update for 1995–1996. , 266(2), 125–133. doi:10.1016/s0020-1693(97)05910-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research