@article{PhysRevFocus.14.3,
  title = {Focusing Sound without a Lens},
  author = {Lindley, David},
  journal = {Phys. Rev. Focus},
  volume = {14},
  issue = {},
  pages = {3},
  numpages = {1},
  year = {2004},
  month = {Jul},
  doi = {10.1103/PhysRevFocus.14.3},
  url = {http://link.aps.org/doi/10.1103/PhysRevFocus.14.3},
  publisher = {American Physical Society}
}