@article{Physics.4.2,
  title = {Invisibility cloak for ultrasonic waves},
  author = {Chan, Che Ting},
  journal = {Physics},
  volume = {4},
  issue = {},
  pages = {2},
  numpages = {1},
  year = {2011},
  month = {Jan},
  doi = {10.1103/Physics.4.2},
  url = {http://link.aps.org/doi/10.1103/Physics.4.2},
  publisher = {American Physical Society}
}