@article{5005,
  author = {Klaus Gheri and Philippe Grangier and Jean-Philippe Poizat and D. Walls},
  title = {Quantum-nondemolition measurements using ghost transitions},
  year = {1992},
  journal = {Physical Review A},
  volume = {46},
  pages = {4276-4285},
  month = {Jan-10-1992},
  issn = {1050-2947},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.46.4276},
  doi = {10.1103/PhysRevA.46.4276},
}