@article{NSR1961AX01,
  author="J. D. {Axe} and H. J. {Stapleton} and C. D. {Jeffries}",
  title="Paramagnetic Resonance Hyperfine Structure of Tetravalent Pa$^{231}$ in Cs$_{2}$ZrCl$_{6}$",
  journal="Phys.Rev.",
  year=1961,
  volume="121",
  pages="1630"
}
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