@article{NSR1991PI11, author="W. {Pietsch} and G. H. {Guthohrlein} and H. {Jager} and L. {Windholz}", title="Hyperfinestructure Constants of the Eu-I Level 4f$^{7}$6s6p z$^{6}$P$_{7 / 2}$", journal="Z.Phys.", year=1991, volume="D21", pages="189" }
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