@article{NSR1987KN10, author="H. {Knab} and M. {Schupp} and G. {Werth}", title="Precision Spectroscopy on Trapped Radioactive Ions: Ground-state hyperfine splittings of $^{133}$Ba$^{+}$ and $^{131}$Ba$^{+}$", journal="Europhys.Lett.", year=1987, volume="4", pages="1361" }
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