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Zhen-Yu Li; Duan-Jun Xu; Wei-Liang Shi; De-Yu Chen; Jing-Yun Wu; Michael Y. Chiang. (2002). Synthesis, Characterization and Crystal Structure of (2, 2′-Bipyridine) (μ-maleato) copper (II) Dihydrate. , 20(4), 390–394. doi:10.1002/cjoc.20020200418 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research