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M. Y. Redko; R. H. Huang; J. E. Jackson; J. F. Harrison; J. L. Dye. Barium azacryptand sodide, the first alkalide with an alkaline Earth cation, also contains a novel dimer, (Na2)2−. J. Am. Chem. Soc. 2003, 125 (8): 2259–2263. PMID 12590555. doi:10.1021/ja027241m.