@misc{indiciae4c7798150ca6,
  title = {Physical parameters defining the changing structure of a coronal hole},
  author = {Vorpahl, J. A. and Broussard, R. M.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780037768},
  note = {Source identifier: 19780037768}
}