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P. Esparza; M.E. Borges; L. Díaz; M.C. Alvarez-Galván; J.L.G. Fierro. (2010). Photodegradation of dye pollutants using new nanostructured titania supported on volcanic ashes. , 388(1-2), 7–14. doi:10.1016/j.apcata.2010.07.058 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research