@article{PhysRevFocus.28.13,
  title = {The Purest X-Ray Beam},
  author = {Harris, David},
  journal = {Phys. Rev. Focus},
  volume = {28},
  issue = {},
  pages = {13},
  numpages = {1},
  year = {2011},
  month = {Sep},
  doi = {10.1103/PhysRevFocus.28.13},
  url = {http://link.aps.org/doi/10.1103/PhysRevFocus.28.13},
  publisher = {American Physical Society}
}