@article{PhysRevFocus.12.25,
  title = {A Knotty DNA Problem},
  author = {Krieger, Kim},
  journal = {Phys. Rev. Focus},
  volume = {12},
  issue = {},
  pages = {25},
  numpages = {1},
  year = {2003},
  month = {Dec},
  doi = {10.1103/PhysRevFocus.12.25},
  url = {http://link.aps.org/doi/10.1103/PhysRevFocus.12.25},
  publisher = {American Physical Society}
}