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I. Aavatsmark; G. T. Eigestad; R. A. Klausen; M. F. Wheeler; I. Yotov. (2007). Convergence of a symmetric MPFA method on quadrilateral grids. , 11(4), 333–345. doi:10.1007/s10596-007-9056-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research