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Alam, M.; Schwabe, K.; Krauss, J. K. . (2011). The pedunculopontine nucleus area: critical evaluation of interspecies differences relevant for its use as a target for deep brain stimulation. Brain, 134(1), 11–23. doi:10.1093/brain/awq322 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research