@misc{indiciae20c73338c116,
  title = {Steepened structures in equatorial spread F. 1: New observations},
  author = {Hysell, D. L. and Kelley, M. C. and Swartz, W. E. and Pfaff, R. F. and Swenson, C. M.},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19950033433},
  note = {Source identifier: 19950033433}
}