@article{Physics.4.7,
  title = {A useful pyramid scheme},
  author = {Cava, Robert J.},
  journal = {Physics},
  volume = {4},
  issue = {},
  pages = {7},
  numpages = {1},
  year = {2011},
  month = {Jan},
  doi = {10.1103/Physics.4.7},
  url = {http://link.aps.org/doi/10.1103/Physics.4.7},
  publisher = {American Physical Society}
}