@article{7252,
  author = {P. Drummond and C. Gardiner and D. Walls},
  title = {Quasiprobability methods for nonlinear chemical and optical systems},
  year = {1981},
  journal = {Physical Review A},
  volume = {24},
  pages = {914-926},
  month = {Jan-08-1981},
  issn = {0556-2791},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.24.914},
  doi = {10.1103/PhysRevA.24.914},
}