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King, William R.; Garner, Clifford S. . (1950). Magnetic Evidence for d3s Bond Hybridization in Chromium (II) Acetate. The Oxidation State of Chromium in a Reported Tris(8-Hydroxyquinoline) Chromium (II). The Journal of Chemical Physics, 18(5), 689–. doi:10.1063/1.1747727 
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