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Mehdipour, Iman; Khayat, Kamal H. . (2018). Understanding the role of particle packing characteristics in rheo-physical properties of cementitious suspensions: A literature review. Construction and Building Materials, 161(), 340–353. doi:10.1016/j.conbuildmat.2017.11.147 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research