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S. Zeinali Heris; M. Nasr Esfahany; S.Gh. Etemad. (2007). Experimental investigation of convective heat transfer of Al2O3/water nanofluid in circular tube. , 28(2), 203–210. doi:10.1016/j.ijheatfluidflow.2006.05.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research