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Belik, Alexei A.; Koo, Hyun-Joo; Whangbo, Myung-Hwan; Tsujii, Naohito; Naumov, Panče; Takayama-Muromachi, Eiji . (2007). Magnetic Properties of Synthetic Libethenite Cu <sub/>2</sub> PO <sub/>4</sub> OH:  a New Spin-Gap System. Inorganic Chemistry, 46(21), 8684–8689. doi:10.1021/ic7008418 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research