Discovery of the astatine, radon, francium, and radium isotopes

@article{Fry2012DiscoveryOT,
  title={Discovery of the astatine, radon, francium, and radium isotopes},
  author={C. Fry and M. Thoennessen},
  journal={Atomic Data and Nuclear Data Tables},
  year={2012},
  volume={99},
  pages={497-519}
}
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