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Khan, Rawid; Collop, Andrew C. . (2010). The Use of X-Ray Computed Tomography to Characterize Microdamage in Asphalt. Road Materials and Pavement Design, 11(sup1), 89–109. doi:10.1080/14680629.2010.9690328 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research