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Manfred Fuchs; Jörn Kastner; Michael Wagner; Susan Hawes; John S. Ebersole. (2002). A standardized boundary element method volume conductor model. , 113(5), 702–712. doi:10.1016/s1388-2457(02)00030-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research