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J.R. Dahn; U. von Sacken; C.A. Michal. (1990). Structure and electrochemistry of Li1±yNiO2 and a new Li2NiO2 phase with the Ni (OH)2 structure. , 44(1-2), 87–97. doi:10.1016/0167-2738(90)90049-w 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research