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Kirkpatrick, P. J.; O'brien, M. D.; MacCabe, J. J. . (1993). Trigeminal nerve section for chronic migrainous neuralgia. British Journal of Neurosurgery, 7(5), 483–490. doi:10.3109/02688699308995070 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research