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Fattahpour, Vahidoddin; Baudet, Béatrice Anne; Moosavi, Mahdi; Mehranpour, Mahdi; Ashkezari, Alireza . (2014). Effect of grain characteristics and cement content on the unconfined compressive strength of artificial sandstones. International Journal of Rock Mechanics and Mining Sciences, 72(), 109–116. doi:10.1016/j.ijrmms.2014.09.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research