@misc{indiciaeae3ebef4cdb5,
  title = {Asymmetric ring current at twilight local time},
  author = {Langel, R. A. and Sweeney, R. E.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710053249},
  note = {Source identifier: 19710053249}
}