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Feng, Huan; Pettinari, Matteo; Hofko, Bernhard; Stang, Henrik . (2015). Study of the internal mechanical response of an asphalt mixture by 3-D discrete element modeling. Construction and Building Materials, 77(), 187–196. doi:10.1016/j.conbuildmat.2014.12.022 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research