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Fewox, Christopher S.; Clearfield, Abraham . (2008). Synthesis and Characterization of Protonated Zirconium Trisilicate and Its Exchange Phases with Strontium. The Journal of Physical Chemistry A, 112(12), 2589–2597. doi:10.1021/jp709592x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research