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↑Penneman, R. A.; Mann, J. B. (1976). "'Calculation chemistry' of the superheavy elements; comparison with elements of the 7th period".Proceedings of the Moscow Symposium on the Chemistry of Transuranium Elements: 257–263.doi:10.1016/B978-0-08-020638-7.50053-1.|access-date= requires|url= (help)
