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Atomic Energy Levels as Derived from the Analysis of Optical Spectra – Molybdenum through Lanthanum and Hafnium through Actinium,C. E. Moore,
in Nat. Stand. Ref. Data Ser. 35, Vol. III (Reprint of NBS Circ. 467, Vol. III, 1958), 245 pp. (Nat. Bur. Stand., U.S., 1971)
DOI:10.6028/NBS.NSRDS.35v3
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