Spectroscopy of a single adsorbed atom.

@article{Crommie1993SpectroscopyOA,
  title={Spectroscopy of a single adsorbed atom.},
  author={Crommie and Lutz and Eigler},
  journal={Physical review. B, Condensed matter},
  year={1993},
  volume={48 4},
  pages={2851-2854}
}