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Gamal, Yosr E. E.-D.; Nassef, O. Aied . (2017). Numerical study of threshold intensity dependence on gas pressure in the breakdown of molecular hydrogen induced by excimer laser. Physics of Plasmas, 24(10), 103503–. doi:10.1063/1.4996707 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research