Abstract
I am sorry that in my letter under this title published in NATURE of September 23, p. 481, I included two formulæ not concerned with these spectra. The correct formulæ are:
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PICCARDI, G. New Band Systems in the Gadolinium Oxide Spectrum. Nature 132, 714 (1933). https://doi.org/10.1038/132714d0
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DOI: https://doi.org/10.1038/132714d0