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Ochoa, Douglas Herlemann; Braga, Jez Willian Batista; Machado, Fabricio . (2017). Optimization of the Functional Characteristics of Cleaning Products Through Experimental Design. Journal of Surfactants and Detergents, 20(2), 467–481. doi:10.1007/s11743-016-1921-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research