@article{10720,
  author = {Y. Demkov and C. Kunasz and V. Ostrovskii},
  title = {United-atom approximation in the problem of Σ-Π transitions during close atomic collisions},
  year = {1978},
  journal = {Physical Review A},
  volume = {18},
  pages = {2097-2106},
  month = {Jan-11-1978},
  issn = {0556-2791},
  url = {http://link.aps.org/doi/10.1103/PhysRevA.18.2097},
  doi = {10.1103/PhysRevA.18.2097},
}