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Khan, M A; Bouet, G; Do Thanh, X; Coquin, A-S; Said, M . (1996). Spring Time and Fall Time Effects of 1,25-Dihydroxyvitamin D3, Cobalt (II) and (CoCl2(1,25(OH)2D3)4) Complex on Renal and Cerebral Enzymatic Markers in Rats. Biological Rhythm Research, 27(1), 105–112. doi:10.1076/brhm.27.1.105.12939 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research