@article{PhysRevFocus.3.21,
  title = {The de Broglie Wavelength of a Packet of Light},
  author = {Appell, David},
  journal = {Phys. Rev. Focus},
  volume = {3},
  issue = {},
  pages = {21},
  numpages = {1},
  year = {1999},
  month = {Apr},
  doi = {10.1103/PhysRevFocus.3.21},
  url = {http://link.aps.org/doi/10.1103/PhysRevFocus.3.21},
  publisher = {American Physical Society}
}