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Zong, Meng; Huang, Ying; Zhang, Na . (2015). Reduced graphene oxide-CoFe2O4 composite: Synthesis and electromagnetic absorption properties. Applied Surface Science, 345(), 272–278. doi:10.1016/j.apsusc.2015.03.203 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research