@misc{indiciaeee870cf7097b,
  title = {Lamb shift in the},
  author = {Fan, C. Y. and Garcia-Munoz, M. and Sellin, I. A.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670060473},
  note = {Source identifier: 19670060473}
}