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Yang, Jun; Fang, Tie; Ma, Shunchang; Yang, Shucheng; Qi, Jianfa; Qi, Zhen; Cun, Enhao; Yu, Chunjiang . (2011). Large and giant petroclival meningiomas: therapeutic strategy and the choice of microsurgical approaches – report of the experience with 41 cases. British Journal of Neurosurgery, 25(1), 78–85. doi:10.3109/02688697.2010.539716 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research