@article{2340,
  author = {Francesca Ferlaino and S. Knoop and M. Berninger and W. Harm and Jose D'Incao and H.-C. Nägerl and R. Grimm},
  title = {Evidence for Universal Four-Body States Tied to an Efimov Trimer},
  year = {2009},
  journal = {Physical Review Letters},
  volume = {102},
  month = {Jan-04-2009},
  issn = {0031-9007},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.102.140401},
  doi = {10.1103/PhysRevLett.102.140401},
}