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Ouzzane, Mohamed; Eslami-Nejad, Parham; Badache, Messaoud; Aidoun, Zine . (2015). New correlations for the prediction of the undisturbed ground temperature. Geothermics, 53(), 379–384. doi:10.1016/j.geothermics.2014.08.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research