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Urazhdin, S.; Birge, Norman O.; Pratt, W. P.; Bass, J.. (2004). Switching current versus magnetoresistance in magnetic multilayer nanopillars. Applied Physics Letters, 84(9), 1516–. doi:10.1063/1.1651645 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research