@misc{indiciae21836d1458a8,
  title = {Modeling boot-shaped coronal holes using SOHO-MDI magnetic measurements},
  author = {Zhao, X. P. and Hoeksema, J. T. and Scherrer, P. H.},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/19990028159},
  note = {Source identifier: 19990028159}
}