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de la Villa, R. Vigil; De Soto, I. S.; García-Giménez, R.; Frías, M. . (2017). Thermodynamic Evaluation of Pozzolanic Reactions between Activated Pozzolan Mix of Clay Waste/Fly Ash and Calcium Hydroxide. Journal of Materials in Civil Engineering, 29(8), 04017065–. doi:10.1061/(asce)mt.1943-5533.0001940 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research