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DE AZCÁRRAGA, JOSÉ A.; KAMIMURA, KIYOSHI; LUKIERSKI, JERZY . (2013). MAXWELL SYMMETRIES AND SOME APPLICATIONS. International Journal of Modern Physics: Conference Series, 23(), 350–356. doi:10.1142/s2010194513011604 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research