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Nygren, Martin A.; Pettersson, Lars G. M.; Barandiarán, Zoila; Seijo, Luis . (1994). Bonding between CO and the MgO(001) surface: A modified picture. The Journal of Chemical Physics, 100(3), 2010–. doi:10.1063/1.466553 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research