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Cakoni, Fioralba; Kress, Rainer . (2013). Integral equation methods for the inverse obstacle problem with generalized impedance boundary condition. Inverse Problems, 29(1), 015005–. doi:10.1088/0266-5611/29/1/015005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research