@article{4766,
  author = {Murray Holland and D. Walls and Peter Zoller},
  title = {Quantum nondemolition measurements of photon number by atomic beam deflection},
  year = {1991},
  journal = {Physical Review Letters},
  volume = {67},
  pages = {1716-1719},
  month = {1991-09},
  issn = {0031-9007},
  doi = {10.1103/PhysRevLett.67.1716},
}