@misc{indiciaead1429aaf7c2,
  title = {Relativistic corrections to the Bethe sum rule},
  author = {Leung, P. T. and Rustgi, M. L. and Long, S. A. T.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19860047486},
  note = {Source identifier: 19860047486}
}