@article{NSR1985BE34,
  author="A. {Bernard} and H. {Bruggemeyer} and V. {Pfeufer}",
  title="Changes in Mean-Square Nuclear Charge Radii in Er from Optical Isotope Shifts by Laser-Atomic Beam Spectroscopy",
  journal="Z.Phys.",
  year=1985,
  volume="A322",
  pages="1"
}
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