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García-Moreno, Olga; Fernández, Adolfo; Torrecillas, Ramón . (2012). Sintering of mullite–β-eucryptite ceramics with very low thermal expansion. International Journal of Materials Research, 103(4), 416–421. doi:10.3139/146.110700 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research