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Chang, Jun Young; Park, Hyun; Kwon, Oki; Han, Moon-Ku . (2017). Restenosis after stenting in symptomatic vertebral arterial orifice disease and considerations for better outcome. Interventional Neuroradiology, 23(2), 180–185. doi:10.1177/1591019916680113 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research