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Zhang, Xu-Dong; Pang, Jian-Dong; Li, Ya-Meng; Ju, Zhan-Feng . (2014). A thermally stable pcu network based on ferromagnetic dinuclear Ni(II) units. Journal of Molecular Structure, 1058(), 272–276. doi:10.1016/j.molstruc.2013.11.024 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research