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Houcine Bouchaala, Youssef Boudabbous, Mohamed Baka Elayech. (2013). Finite Tournaments with a Nonempty Diamonds’ Support. , 29(6), 1653–1673. doi:10.1007/s00373-012-1233-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research