@article{7356,
  author = {G. Agarwal and John Cooper},
  title = {Effective two-level description of pressure-induced extra resonances in four-wave mixing},
  year = {1982},
  journal = {Physical Review A},
  volume = {26},
  pages = {2761-2767},
  month = {Jan-11-1982},
  issn = {0556-2791},
  doi = {10.1103/PhysRevA.26.2761},
}