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2. F.M. Phelps III: MIT Wavelength Tables, Vol.2: Wavelengths by Element (MIT Press, Cambridge, Mass. 1982)
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4. J. Reader, C.H. Corliss, W.L. Wiese, G.A. Martin: Wavelengths and Transition Probabilities for Atoms and Atomic Ions. NSRDS-NBS 68 (US Govt. Prtg. Off., Washington, DC 1980)
5. A.R. Striganov, N.S. Sventitskii: Tables of Spectral Lines in Neutral and Ionized Atoms (IFI/Plenum, New York 1968)