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(en) M. Y. Redko, R. H. Huang, J. E. Jackson et J. F. Harrison, « Barium azacryptand sodide, the first alkalide with an alkaline Earth cation, also contains a novel dimer, (Na2)2− », J. Am. Chem. Soc., vol. 125, no 8, , p. 2259–2263 (PMID12590555, DOI10.1021/ja027241m)
(en) M. Y. Redko, M. Vlassa, J. E. Jackson et A. W. Misiolek, « "Inverse sodium hydride": a crystalline salt that contains H+ and Na− », J. Am. Chem. Soc., vol. 124, no 21, , p. 5928–5929 (PMID12022811, DOI10.1021/ja025655+)