@article{7111,
  author = {A. Ben-Reuven},
  title = {Theory of two-atom coherence in gases. I. Master equations},
  year = {1980},
  journal = {Physical Review A},
  volume = {22},
  pages = {2572-2584},
  month = {Jan-12-1980},
  issn = {0556-2791},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.22.2572},
  doi = {10.1103/PhysRevA.22.2572},
}