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Robert J. Geller; Takao Ohminato. (1994). Computation of synthetic seismograms and their partial derivatives for heterogeneous media with arbitrary natural boundary conditions using the Direct Solution Method. , 116(2), 421–446. doi:10.1111/j.1365-246x.1994.tb01807.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research