@article{Physics.2.19,
  title = {An astronomical solution to an old quantum problem},
  author = {Stroud, C. R.},
  journal = {Physics},
  volume = {2},
  issue = {},
  pages = {19},
  numpages = {1},
  year = {2009},
  month = {Mar},
  doi = {10.1103/Physics.2.19},
  url = {http://link.aps.org/doi/10.1103/Physics.2.19},
  publisher = {American Physical Society}
}