@article{9611,
  author = {I. Percival and M. Seaton},
  title = {Low Energy Cross Sections for Transitions between Highly Excited States of Atoms},
  year = {1972},
  journal = {Astrophysical Letters},
  volume = {11},
  chapter = {31},
  pages = {31-33},
  url = {http://articles.adsabs.harvard.edu/full/1972ApL....11...31P},
  note = {JILA Pub. 849},
}