@misc{indiciaec1a858ddf2e5,
  title = {An orbiting clock experiment to determine the gravitational red shift},
  author = {Kleppner, D. and Ramsey, N. F. and Vessot, R. F. C.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700045834},
  note = {Source identifier: 19700045834}
}